33. A mathematics competition uses the following scoring procedure to discourage students from guessing (choosing an answer randomly) on the multiple-choice questions. For each correct response, the score is 7. For
each question left unanswered, the score is 2. For each incorrect response, the score is O. If there are 5 choices
for each question, what is the minimum number of choices that the student must eliminate before it is advan-
tageous to guess among the rest?
(A) O
(B) 1
(C) 2.
(D) 3
(E) 4