Question: "What did the diplomatic corps have trouble with?"  Context: "In the 20th century after decades of intense warfare and political turmoil terms such as "Near East", "Far East" and "Middle East" were relegated to the experts, especially in the new field of political science. The new wave of diplomats often came from those programs. Archaeology on the international scene, although very much of intellectual interest to the major universities, fell into the shadow of international relations. Their domain became the Ancient Near East, which could no longer be relied upon to be the Near East. The Ottoman Empire was gone, along with all the other empires of the 19th century, replaced with independent republics. Someone had to reconcile the present with the past. This duty was inherited by various specialized agencies that were formed to handle specific aspects of international relations, now so complex as to be beyond the scope and abilities of a diplomatic corps in the former sense. The ancient Near East is frozen in time. The living Near East is primarily what the agencies say it is. In most cases this single term is inadequate to describe the geographical range of their operations. The result is multiple definitions."  Answer:
A:
international relations