If n is a positive integer, the symbol n! (read “n factorial”) represents the product of the integers from 1 to n. For example, 4!=(1)(2)(3)(4) or 4!=24. The ones (units) digit of the sum 1!+2!+3!+4!+5!+6!+7!+8!+9!+10! is
Answer Choices
A. 1
B. 3
C. 5
D. 7
E. 9