Jill Johnson Owns a Pizzeria

Jill Johnson owns a pizzeria. She currently produces 10,000 pizzas per month at a total cost of $500. If she produced one more pizza her total cost rises to $500.11. What does this tell us about Jill's marginal cost of producing pizzas?

A) The marginal cost of producing pizzas is constant.
B) The marginal cost of producing pizzas is falling.
C) The marginal cost of producing pizzas cannot be determined without more information.
D) The marginal cost of producing pizzas is rising.