Mackenzie Wants to Produce More Pies

Mackenzie wants to produce more pies. If she rents another oven for $100, she can make another 200 pies. If she hires another worker at a wage of $15, she can make another 45 pies. What statement is true based on this information?

A) Using either another oven or another worker will minimize costs.
B) She should use another oven to minimize costs.
C) She should hire another worker to minimize costs.
D) The marginal product of labor per dollar spent is less than the marginal product of capital per dollar spent.