Answer:
d. to decrease and equilibrium quantity to increase.
Explanation:
As we know that
Equilibrium is the point at which the quantity demanded equal to the quantity supplied
In equation, it is
Equilibrium = Quantity demanded = Quantity supplied
Now if the supply of a product increases, the equilibrium price decreases while the equilibrium quantity increases
And, if the supply of a product decreases, the equilibrium price increases while the equilibrium quantity decreases