Asteroid Defense Is Likely to Be ______ by the Market

Asteroid defense is likely to be ______ by the market because ______.

A) efficiently provided; there are low transaction costs to collecting the operational funding, as suggested by the Coase theorem.
B) overprovided; of the market power of the military-industrial complex.
C) either overprovided or underprovided; it is a common good.
D) underprovided; there is an incentive to free ride.