If an emissions tax of $500 per unit and the price of a tradeable emissions permit of $500 is established:
A) only firms with newer technology will reduce their pollution to the point where their marginal benefit is $1,000.
B) only firms with older technology will reduce their pollution to the point where their marginal benefit is $1,000.
C) firms will reduce pollution to the point where its marginal benefit is $1,000.
D) firms will reduce pollution to the point where its marginal benefit is $500.