Answer:
b) informational; the autokinetic effect
Step-by-step explanation:
Informational social influence: The term informational social influence refers to the process in which an individual acquires knowledge by conforming or maybe because the person believes that the other person is correct or right in opinion.
Autokinetic effect: The term autokinetic effect refers to the illusory movement of a particular object which is still or constant.
In the question above, the given statement is an example of informational social influence, as illustrated in the classic study involving the autokinetic effect.