Which of the Following Research Questions Is Most Likely to Be

Which of the following research questions is most likely to be asked by a cognitive psychologist?

A) To what extent is student learning influenced by the sociocultural makeup of the class?
B) Do students learn material better when the learning takes place over time or when they "cram" for an exam?
C) Which stress reduction techniques are most effective for college students to reduce the stress of balancing academic and social demands?
D) Do students who graduate in the top 1% of their class share any common characteristics?