The correct option is A Chancellor
Becket was the son of a wealthy Norman Londoner. He went to work in the household of Theobald, Archbishop of Canterbury, where he was very successful and became an Archdeacon. Theobald recommended him to King Henry II, who made him Chancellor (1155). Becket became a successful and trusted friend and adviser. Henry sent his son, also called Henry, as a page to Becket's household. Hence, Option A is correct. The rest of the titles are achieved by serving in the army, and not by ascription of titles, hence, incorrect.