Final answer:
The correct answer is option b) Archbishop of Canterbury.
Step-by-step explanation:
The title surprisingly bestowed upon Becket by Henry is Archbishop of Canterbury. This was an unexpected choice as Thomas Becket was not originally a member of the clergy but served as the Chancellor to Henry II.
Henry believed that Becket would support royal authority in the church, but Becket’s new position led him to defend church interests, causing a significant conflict with the king, which became a historical turning point in the relationship between the church and the state in England.