Answer:
D. A student assures his teacher several times that he'll turn in the homework
Step-by-step explanation:
The term reaffirmation is used to describe when someone reconfirms or reassures someone, a group of people, etc. of a belief.
In this specific question, answers A, B, and C do not demonstrate someone reassuring or reconfirming anything. B may look like a possible answer, but it is incorrect since the student is only telling his teacher a belief one time. The prefix "re--" means "again," so the correct answer will demonstrate an affirmation performed at least twice.
In D, the student is assuring his teacher several times that he will turn in his homework, properly demonstrating reassurance or a reaffirmation.