[Q]: Extract the answer to the question from the following context. Question: Text can either be included by intention or what? Context: When comparing different documents, or "witnesses", of a single, original text, the observed differences are called variant readings, or simply variants or readings. It is not always apparent which single variant represents the author's original work. The process of textual criticism seeks to explain how each variant may have entered the text, either by accident (duplication or omission) or intention (harmonization or censorship), as scribes or supervisors transmitted the original author's text by copying it. The textual critic's task, therefore, is to sort through the variants, eliminating those most likely to be un-original, hence establishing a "critical text", or critical edition, that is intended to best approximate the original. At the same time, the critical text should document variant readings, so the relation of extant witnesses to the reconstructed original is apparent to a reader of the critical edition. In establishing the critical text, the textual critic considers both "external" evidence (the age, provenance, and affiliation of each witness) and "internal" or "physical" considerations (what the author and scribes, or printers, were likely to have done).
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[A]: by accident


[Q]: Extract the answer to the question from the following context. Question: What was the purpose of Microsoft's pop-up stores? Context: Microsoft began an advertising campaign centered around Windows 8 and its Surface tablet in October 2012, starting with its first television advertisement premiering on October 14, 2012. Microsoft's advertising budget of US$1.5–1.8 billion was significantly larger than the US$200 million campaign used to promote Windows 95. As part of its campaign, Microsoft set up 34 pop-up stores inside malls (primarily focusing on Surface), provided training for retail employees in partnership with Intel, and collaborated with the electronics store chain Best Buy to design expanded spaces to showcase devices. In an effort to make retail displays of Windows 8 devices more "personal", Microsoft also developed a character known in English-speaking markets as "Allison Brown", whose fictional profile (including personal photos, contacts, and emails) is also featured on demonstration units of Windows 8 devices.
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[A]: retail displays of Windows 8 devices


[Q]: Extract the answer to the question from the following context. Question: Which of the following did not become more common after the Industrial Revolution: raw materials, troops or efficient methods of production? Context: With the advent of the Industrial Revolution, Britain surged ahead of its European rivals. Demand for Indian commodities was boosted by the need to sustain the troops and the economy during the war, and by the increased availability of raw materials and efficient methods of production. As home to the revolution, Britain experienced higher standards of living. Its spiralling cycle of prosperity, demand and production had a profound influence on overseas trade. The company became the single largest player in the British global market. William Henry Pyne notes in his book The Microcosm of London (1808) that:
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[A]: troops


[Q]: Extract the answer to the question from the following context. Question: how were floods able to be forecast? Context: The tide-predicting machine invented by Sir William Thomson in 1872 was of great utility to navigation in shallow waters. It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location.
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[A]:
a system of pulleys and wires to automatically calculate predicted tide levels