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: the average of marks obtained by 120 boys was 38. if the average of marks of passed boys was 39 and that of failed boys was 15, the number of boys who passed the examination is ?
Options: a. 100, b. 110, c. 115, d. 125, e. 140
Output:
c