Detailed Instructions: 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: at jerri ' s pet shop, 60 cups of bird seed are used every 5 days to feed 20 parakeets. how many cups of bird seed would be required to feed 10 parakeets for 5 days ?
Options: a. 45.6, b. 20, c. 9, d. 30, e. 65
A:
d