How should the government initially allocate transferable emissions permits among firms if it wants the target level of emissions to be achieved at minimum cost? A. Give more permits to firms that have lower marginal abatement costs. B. Give each firm the same number of permits. C. Give permits to firms in direct proportion to the amount of emissions each generates. D. It doesn't matter how the permits are allocated as long as the firms can buy and sell them in a competitive market.