The probability that a student passes an exam is 1/3. If 5 people took the exam, what is the probability that only 4 of them pass?

A. (1/3)^5

B. 4(2/3)^4 * 4(1/3)

C. 4(1/3)^4 * (2/3)

D. (2/3)^5

E. 5(1/3)^4 * (2/3)

F. None of the above

Can someone post up what the answer is and an explanation for this?