Information:  - Alix of France (JulyAugust 1150  1197/1198) was the second daughter born to King Louis VII of France and Duchess Eleanor of Aquitaine.  - Joanna I of Burgundy ( 1191 -- 1205 ) , also called Joanna of Hohenstaufen , was Countess of Burgundy , daughter of Otto I , Count of Burgundy and Margaret , Countess of Blois . Born in 1191 , Joanna was Countess from the time of her father 's assassination at Besançon in 1200 until her own death in 1205 , whereupon her sister , Beatrice II , Countess of Burgundy , succeeded her .  - Beatrice of Burgundy (1143  15 November 1184) was the only daughter of Renaud III, Count of Burgundy and Agatha of Lorraine. Orphaned as a child, she inherited the County of Burgundy and became one of the most desirable heiresses in France. She then became the second wife of Frederick I, Holy Roman Emperor, and as such Holy Roman Empress, at the age of about 12. Beatrice was active at the Hohenstaufen court, encouraging literary works and chivalric ideals. She accompanied her husband on his travels and campaigns across his kingdom, and he was known to be under Beatrice's influence. She was crowned Holy Roman Empress by Antipope Paschal III in Rome on 1 August 1167, and later as Queen of Burgundy at Vienne in August 1178. Beatrice died young in 1184, 6 years before her much older husband.   - Margaret of Blois (French: "Marguerite") (died 1230) was daughter of Theobald V of Blois and his wife Alix of France. She was "suo jure" countess of Blois from 1218 to 1230.  - Otto I (between 1167 and 1171  13 January 1200) was Count of Burgundy from 1190 to his death and briefly Count of Luxembourg from 1196 to 1197. He was the fourth son of Frederick I, Holy Roman Emperor by his second wife Beatrice I, Countess of Burgundy, daughter of Count Renaud III.    What object entity has the relation of 'mother' with the subject 'joan i'?   Choices: - agatha of lorraine  - alix of france  - beatrice i , countess of burgundy  - desirable  - margaret of blois
A:
margaret of blois