A table of data had 36 entries arranged in 9 rows and 4 columns. A computer
program randomly deleted exactly one entry in each row. If the column had the
greatest number of entries deleted, what is the least number of entries that
could have been deleted in that column?
(A) 2 (B) 3 (C) 4 (D) 5 (E) 6
我对题目的理解如下图