Given the Table Below,what Is the Short-Run Profit-Maximizing Level of Output

Given the table below,what is the short-run profit-maximizing level of output for the firm?

A) 2 units
B) 3 units
C) 4 units
D) 5 units
At output level of four units,total revenue exceeds total cost by $7.This is the maximum difference between total revenue and total cost,which means profit is maximized.