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.
Input: Problem: if $ 5,000 is invested in an account at a simple annual rate of r percent, the interest is $ 250. when $ 16,000 is invested at the same interest rate, what is the interest from the investment ?
Options: a. $ 700, b. $ 750, c. $ 850, d. $ 800, e. $ 900
Output:
d