Diagram shows excess demand at price _______ and equilibrium at price_______.

p_c, p*

The correct answer is Option 2: p_c , p*

The equilibrium price and quantity of wheat are p* and q* respectively. When the government imposes price ceiling at $p_C$ which is lower than the equilibrium price level, there will be an excess demand for wheat in the market at that price. The consumers demand $q_c$ kilograms of wheat whereas the firms supply $q'_c$ kilograms.

Thus, Excess demand exists at price p_c and equilibrium is at price p*.