For positive integer n, the factorial notation n! represents the product of the integers

For positive integer n, the factorial notation n! represents the product of the integers

For positive integer n, the factorial notation n! represents the product of the integers form n to 1. (For example, 6! =6* 5* 4* 3* 2* 1 ) What value of N satisfies the following equation?

(A) 10 (B) 11 (C) 12 (D) 13 (E) 14

answer：A