You will be given a definition of a task first, then some input of the task.
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: how many 3 - digit integers between 311 and 401, exclusive, are divisible by 3 when the tens digit and the hundered digit are switched ?
Options: a. 30, b. 19, c. 22, d. 3, e. 90
Output:
a