The second answer is correct (B).
Solomon Asch is considered one of the pioneers of social psychology, the area in which he concentrated his research. The main of their areas of study is the influence others may have on our behavior.
Asch's experiment consisted of a series of researches whose main purpose was to prove that people submit and adopt an attitude of conformity towards the groups. The author demonstrated that a good part of the people of his experimental sample changed his answer by the majority response, although the evidence showed incosistencia in the response of the groups.
"Most social acts must be understood in their surroundings in order to lose meaning if they are isolated. No error is more serious when we think of social facts than not taking into account its place and function" Solomon Aschm (1952).