Which statement regarding dependent t-tests is false?

A. One disadvantage is called the "carry effect" where a subject's performance may improve simply because they've experienced the test for a second time.

B. One advantage is that, because the pre and post test groups are made up of the same subjects, there is no variance from subject to subject.

C. One advantage is that, because the pre and post test groups are made up of the same subjects, extraneous variables are automatically controlled for.

D. None of the above.