求PREP-PS-2-193 思路

193.
                20876-!-item-!-187;#058&013435

In a class of 30 students, 2 students did not borrow any books from the library, 12 students each borrowed 1 book, 10 students each borrowed 2 books, and the rest of the students each borrowed at least 3 books.  If the average (arithmetic mean) number of books borrowed per student was 2, what is the maximum number of books that any single student could have borrowed?

(A) 3

(B) 5

(C) 8

(D) 13

(E) 15

求思路....

谢谢