Answer:
B 144
Step-by-step explanation:
In Math, the exclamation mark is called factorial. The factorial of a number n is the product of all integers less than or equal to n but greater than or equal to 1. For example, the factorial of 5 is 5! = 5*4*3*2*1
With this, 4! = 4*3*2*1 and 3! = 3*2*1
Therefore, 4!3! = 4! *3! = 4*3*2*1*3*2*1 = 144
