-Refer to the Above Figure $P _ { 1 }$ And Output Of

-Refer to the above figure.The profit-maximizing price and output for this monopolist are

A) a price of $P _ { 1 }$ and output of
$\mathrm { Q } _ { 1 }$ .
B) a price of $\mathrm { P } _ { 4 }$ and output of
$\mathrm { O } _ { 1 }$ .
C) a price of $P _ { 2 }$ and output of
$\mathrm { Q } _ { 2 }$ .
D) a price of $\mathrm { P } _ { 3 }$ and output of
$\mathrm { Q } _ { 3 }$ .