Answer: the correct answer is B Foot-in-the-door phenomenon
Explanation:
Foot-in-the-door (FITD) phenomenon is a compliance tactic that aims at getting a person to agree to a large request by having them agree to a modest request first.
The principle involved is that a small agreement creates a bond between the requester and the requestee. Even though the requestee may only have agreed to a trivial request out of politeness, this forms a relationship which – when the requestee attempts to justify the decision to themselves – may be mistaken for a real affinity with the requester, or an interest in the subject of the request. When a future request is made, the requestee might feel obliged to act concurrently with the earlier one.