The primary difference between the research of Sherif (1936) and Asch (1951) is that:

A. Sherif was able to demonstrate conformity, whereas Asch was not.
B. Asch was able to demonstrate conformity, whereas Sherif was not.
C. Sherif relied on an ambiguous task, whereas Asch used an unambiguous task.
D. Asch relied on an ambiguous task, whereas Sherif used an unambiguous task.

C. Sherif relied on an ambiguous task, whereas Asch used an unambiguous task.