-Using the Above Figure,the Perfectly Competitive Firm Should Shut Down $P _ { 1 }$

-Using the above figure,the perfectly competitive firm should shut down if the market price is below

A) $P _ { 1 }$ .
B) $P _ { 2 }$ .
C) $\mathrm { P } _ { 3 }$ .
D) $\mathrm { P } _ { 4 }$ .