Definition: In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Input: Problem: 25 % of 30 % of 45 % is equal to ? 
Options: a ) 0.03375 , b ) 0.03372 , c ) 0.0337 , d ) 0.03377 , e ) 0.03376
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
a