Asteroid defense is likely to be $\_\_\_\_\_$ by the market because $\_\_\_\_\_.$

a$.$

underprovided; there is an incentive to free$-$ride

b$.$

efficiently provided; there are low transaction costs to collecting the operational funding, as suggested by the Coase theorem

c$.$

either overprovided or underprovided; it is a common good

d$.$

overprovided; of the market power of the military$$industrial complex

Clear my choice