Suppose that the production of oranges reduces global warming. The equilibrium price of oranges is _ because not all of the _ are accounted for in the marketplace.

Suppose that the production of oranges reduces global warming. The equilibrium price of oranges is _ because not all of the _ are accounted for in the marketplace.
A.optimal; costs
B.too low; benefits
C.too low; costs
D.too high; benefits
正确答案：too low; benefits