Q $28$: At the new equilibrium point reached in Q$27$ answer by pollution tax, the rule of efficient internalization of externality can be described as which if the conditions below?

Note: MB $=$ Marginal Benefit, MC $=$ Marginal Cost, MSB $=$ Marginal Social Benefit, and MSC $=$ Marginal Social Cost

$MC=MB$

None of these three logics are correct answers

$MSC=MSB$

$MSC=MB$