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: if x / 4 years ago roger was 21 years old and x / 4 years from now he will be 4 x years old, how old will he be 5 x years from now ?
Options: a. 32, b. 35, c. 30, d. 40, e. 70
A:
e