The equation M=100−2.95x represents the amount of money, M, remaining in an account after purchasing x school lunches. Which statement is true?

a. The account starts with $2.95, and $100 is added for each school lunch purchase.
b. The account starts with $2.95, and $100 is subtracted for each school lunch purchase.
c. The account starts with $100, and $2.95 is added for each school lunch purchase.
d. The account starts with $100, and $2.95 is subtracted for each school lunch purchase.