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.
Problem:Problem: a large box contains 20 small boxes and each small box contains 32 chocolate bars. how many chocolate bars are in the large box ?
Options: a. a. 220, b. b. 490, c. c. 380, d. d. 450, e. e. 640
Solution:
e