Answer:
b. free gasoline given to people as an incentive to a rent a car
Explanation:
A price ceiling is when the government or an agency of the government sets the maximum price that can be charged for a good or service.
If a price ceiling is binding, it is usually set below equilibrium price.
When price ceiling is binding, there is usually a shortage as a result of an excess of demand over supply.
There would be no need for a incentive to encourage consumers to demand for a product.
Because price is below equilibrium price, suppliers would be unwilling to replace old rental cars with new ones.
Suppliers might be unwilling to do proper engine maintenance in a bid to reduce cost.
Suppliers might hoard their rental cars in response to the binding price ceiling. So, there would be an accumulation of dirt in the interior of rental cars .
I hope my answer helps you