Suppose demand increases and supply decreases. what will happen?

A decrease in demand and an increase in supply will cause a fall in equilibrium price, but the effect on equilibrium quantity cannot be determined. For any quantity, consumers now place a lower value on the good, and producers are willing to accept a lower price; therefore, price will fall.

To be honest, here's what i think. i think the answer is (and i'm not exactly sure), that it is, both personal and household income.

The answer is c) it has a lower cost to attend