The above figure shows the market for steel ingots. If the market is competitive, and the government institutes a $100 specific tax on steel, then

A) less than the socially optimal quantity of steel is produced.
B) the socially optimal quantity of steel of 50 units is produced.
C) the socially optimal quantity of steel of 100 units is produced.
D) more than the socially optimal quantity of steel is produced.

A