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