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.

[Q]: Problem: what is the value of n if the sum of the consecutive odd intergers y from 1 to n equals 169 ?
Options: a. 47, b. 25, c. 37, d. 33, e. 29
[A]: b

[Q]: Problem: what will be the compound interest on a sum of rs. 20,000 after 3 years at the rate of 12 % p. a. ?
Options: a. rs. 8098.56, b. rs. 9720, c. rs. 10123.20, d. rs. 10483.20, e. none
[A]: a

[Q]: Problem: tim came second in math. when his mother asked him how much he had scored, he answered that he got the sum of the first 12 even numbers. his mother immediately worked out the answer. how much had he scored in math ?
Options: a. 156, b. 146, c. 158, d. 187, e. 160
[A]:
a