6. An exam consists of 6 multiple-choice questions, with the following scoring rules: each person starts with 6 points, gets 4 points for each correct answer, loses 1 point for each wrong answer, and gets 0 points for not answering. Now, 51 students are taking the exam, so at least ( ) students have the same score.
(A) 3
(B) 4
(C) 5
silyou.
(D) 6
【Answer】A