Answer: Option D
Explanation: In simple words, equilibrium refers to a situation when market forces of demand and supply are balanced and equal. In such a situation the suppliers are supplying the goods in the quantity and price at which the potential and existing customers are willing to buy.
In a non equilibrium, there must be an excess supply or demand which will further result in change in prices or quantity supplied.
Thus, from the above we can conclude that the correct option is D.