Two Students Taking a Multiple Choice Exam with 20 Questions $\mu$

Two students taking a multiple choice exam with 20 questions and four choices for each question have the same incorrect answer on seven of eight incorrectly answered problems. The probability that student B guesses the same incorrect answer as student A on a particular question is 1/4. If the student is guessing, the guess for one problem is independent of the guess for the other problems. The number of guesses by student B that agree with those of student A has mean and variance given by:

A) $\mu$ = 2 and $\sigma$ ² = 1.5.
B) $\mu$ = 2 and $\sigma$ ² = 1.5².
C) $\mu$ = 4 and $\sigma$ ² = 1.5.
D) $\mu$ = 2 and $\sigma$ = 1.5.