The incentive function of prices:

A) indicates that price increases bring forth more of that resource.
B) is the idea that competitive markets will always clear.
C) applies to all resources.
D) only applies to land.

The incentive function of prices indicates that as the price of a resource increases, producers are incentivized to produce more of it, thus bringing forth more of that resource. This applies to all resources, not just land. The idea that competitive markets will always clear (B) is related to the relationship between supply and demand, but not specifically to the incentive function of prices. Choice D is incorrect as the price incentive applies to all resources, not just land.