Refer to the Graph $P _ { 2 } \text { and output } Q _ { 2 } \text {. }$

Multiple Choice

Refer to the graph. The equilibrium for this economy is

A) at point a.
B) at point b.
C) at price level P $P _ { 2 } \text { and output } Q _ { 2 } \text {. }$
D) at price level P $P _ { 1 } \text { and output } Q _ { 1 } \text {. }$