Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Example Input: Problem: if a no. when divided by 44, gives 432 as quotient and 0 as remainder. what will be the remainder when dividing thesame no. by 31
Options: a. 2, b. 4, c. 5, d. 7, e. 8
Example Output: c

Example Input: Problem: four bells commence tolling together and toll at intervals of 2, 4, 6, 8 seconds respectively. in 18 minutes, how many times do they toll together ?
Options: a. 43, b. 44, c. 45, d. 46, e. 47
Example Output: c

Example Input: Problem: bert and rebecca were looking at the price of a condominium. the price of the condominium was 50 % more than bert had in savings, and separately, the same price was also 25 % more than rebecca had in savings. what is the ratio of what bert has in savings to what rebecca has in savings.
Options: a. 1: 6, b. 1: 3, c. 1: 2, d. 3: 4, e. 5: 6
Example Output:
e