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: the area of a triangle is with base 18 m and height 6 m ?
Options: a. 88 m 2, b. 10 m 2, c. 66 m 2, d. 54 m 2, e. 31 m 2
Example Output: d

Example Input: Problem: find the area of a parallelogram with base 10 cm and height 20 cm.
Options: a. 200, b. 384, c. 200, d. 244, e. 242
Example Output: c

Example Input: Problem: divide rs. 1700 among a, b and c so that a receives 1 / 3 as much as b and c together and b receives 2 / 3 as a and c together. a ' s share is ?
Options: a. 346, b. 425, c. 375, d. 337, e. 639
Example Output:
b