Joe is eating M&Ms. He eats 3 at a time, since he's very organized, and eats them at the beginning of every minute. If his bag of M&Ms originally had 100 candies, then which expression shows how many candies he has left, after T minutes?

A. M = 100+3t

B. M = 3+100t

C. M = 100 - 3t

D. M = 100 - t