Answer:
The answer is a. Ingratiating tactic.
Explanation:
This technique involves becoming more liekable to a person in order to influence their behaviour. This can be done in a variety of ways, such as flattery, comformity of opinions and the use of humour.
Ingratiating has been studied in business. For example, an experiment found out that waiters who used ingratiating tactics received larger tips.