Yann writes down the first n consecutive positive integers, 1,2,3,4, \ldots, n-1, n. He removes four different integers p, q, r, s from the list. At least three of p, q, r, s are consecutive and 100<p<q<r<s. The average of the integers remaining in the list is 89.5625. The number of possible values of s is
Answer Choices
A. 25
B. 23
C. 21
D. 20
E. 22