-Use the Above Figure $\mathrm { Q } _ { 2 }$

-Use the above figure.If a commission regulates the above monopoly using marginal cost pricing,then the industry's output will be ________ and the product's price will be ________.

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