Final answer:
Conformity is the term for giving in to indirect pressure to change behavior and thoughts to match those of a group, even without personal agreement. Option number a is correct.
Step-by-step explanation:
Giving in to indirect pressure to change your behavior and thoughts is called conformity. Conformity is when you change your behavior to go along with the group, even if you do not personally agree with everything the group stands for. This can happen due to various social influences, such as the desire to fit in, feel accepted, or gain information from the group.
Stanley Milgram's Experiment illustrated how people can also show obedience to authority figures, changing their behavior to comply with demands, often because they are concerned about consequences if they don't. Conformity and obedience are important concepts in social psychology and have significant impacts on our behavior and decision-making processes.