An Anderson\:number is a positive integer k less than 10\:000 with the property that k^2 ends with the digit or digits of k. For example, 25 is an Anderson number because 625 ends with 25, but 75 is not an Anderson number because 5625 does not end with 75. If S is the sum of all even Anderson numbers, what is the sum of the digits of S?
Answer Choices
A. 17
B. 18
C. 11
D. 33
E. 24