The Table Below Shows a Competitive Firm's Short-Run Production Function

The table below shows a competitive firm's short-run production function.Labor is the firm's only variable input,and market price for the firm's product is $2 per unit. If market price for the firm's product increases to $5,how many units of labor will the firm employ at a wage rate of $200?

A) 0,the firm shuts down
B) 4
C) 5
D) 6
E) 7