With Respect to Laptop Use in the Classroom, a Study

With respect to laptop use in the classroom, a study on classroom learning revealed that:

A) Students who used laptops in class had better comprehension than students who took notes by hand.
B) Students who used laptops in class had better retention than students who took notes by hand.
C) Students who used laptops in class performed better on tests than students who took notes by hand.
D) Students sitting nearby laptop users learned less than students not sitting nearby laptop users.