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: 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

A: a
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Q: Problem: what is the perimeter of a square field whose diagonal is 8 â ˆ š 2 ?
Options: a. 64 m, b. 32 m, c. 30 m, d. 16 m, e. 18 m

A: b
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Q: Problem: h is a positive integer and 225 and 216 are both divisors of h. if h = ( 2 ^ a. * ( 3 ^ b. * ( 5 ^ c., where a, b and c are positive integers, what is the least possible value of a + b + c ?
Options: a. 4, b. 8, c. 6, d. 7, e. 5

A:
b
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