Given the task definition and input, reply with output. 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: in the mundane goblet competition, 6 teams compete in a " round robin " format: that is, each team plays every other team exactly once. a team gets 3 points for a win, 1 point for a tie ( a draw ), and 0 points for a loss. what is the difference between the maximum total points and the minimum total points that can be gained by all teams ( added together ) in the mundane goblet competition ?
Options: a. 15, b. 30, c. 45, d. 60, e. 75
a