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.

Input: Consider Input: Problem: a bag has 9 green balls and 23 pink balls. how many green balls should be added to the bag so that the ratio of green balls and pink balls in the bag becomes 1: 1 ?
Options: a. 10, b. 11, c. 12, d. 13, e. 14

Output: e


Input: Consider Input: Problem: 30 pens and 75 pencils were purchased for 750. if the average price of a pencil was 2.00, find the average price of a pen.
Options: a. 20, b. 11, c. 12, d. 13, e. 14

Output: a


Input: Consider Input: Problem: at what rate of compound interest per annum will a sum of rs. 1200 become rs. 1348.32 in 2 years ?
Options: a. 6 %, b. 6.5 %, c. 7 %, d. 7.5 %, e. 8 %


Output: a