Instructions: In this task, you need to provide the correct option for a given problem from the provided options.
Input: Problem: how many consecutive zeros are there at the end of 100 ! ( 100 factorial ) ? 
Options: a ) 21 , b ) 22 , c ) 23 , d ) 24 , e ) 25
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
d