3- Suppose the external marginal cost of electricity generation is $3 per megawatt hour; P* is $32, Q* is 200, and QMKTis 225. If the government levies a Pigouvian tax of $3, then:

a- the government will collect total tax revenue of $6,400.

b- the government will collect total tax revenue of $3.

c- the government will collect total tax revenue of $675.

d- the government will collect total tax revenue of $600.