Definition: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Input: Question: What year was Brian named the High King? Passage:The Ui Briuin Seola was one of the major branches of the powerful Ui Briuin dynasty, which had become the dominant force in Connacht by the 8th century. The genealogies list two sons of Murchadh mac Maenach: Urchadh and Urumhain. Urchadh mac Murchadh, King of Maigh Seola (also listed as king of Iarthair Connacht, died 945, in the 14th century Book of Ballymote) was father of Be Binn inion Urchadh, Princess of the Ui Briuin Seola and Queen of Thomond (fl. early 10th century). Be Binn married Cennetig mac Lorcain of Thomond to produce a son who would become the High King of Ireland (Irish: Ard-Ri na hEireann): Brian Boruma mac Cennetig, known in English as Brian Boru (c. 94123 April 1014). Brian broke the near monopoly of the Ui Neill over the High Kingship of Ireland and fought to unite Ireland as a people under one, native king. His father, Cennetig mac Lorcain of Thomond, was one of the principal leaders of the resistance to the Danish Viking incursions. Cennetig had several wives and children but positively assigned Be Binn as the mother of Brian Boruma.
Links: a. Ui Briuin b. Ui Briuin c. Brian Boru d. Brian Boru
Output:
c