-Using the Above Figure,the Price Facing the Perfectly Competitive Firm $P _ { 1 }$

-Using the above figure,the price facing the perfectly competitive firm in the long run will be

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