-Refer to the Above Figure $S _ { 1 }$ Is the Supply Curve That Includes Only Private Costs

-Refer to the above figure. $S _ { 1 }$ is the supply curve that includes only private costs. $S _ { 2 }$
Is the supply curve that includes social costs.The free market rate of output is ________ and the corrected,socially optimal amount of output is ________.

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