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: ashok secured average of 74 marks in 6 subjects. if the average of marks in 5 subjects is 74, how many marks did he secure in the 6 th subject ?
Options: a. 66, b. 74, c. 78, d. 80, e. none of these
b