Consider the following statement: "An increase in the cost of oil will cause the price of a plane ticket to increase. This increase in price will cause a decrease in demand for airline travel and a leftward shift in the demand curve." What is the flaw of this reasoning?
a) The increase in the cost of oil will cause a decrease in the price of a plane ticket.
b) The cost of oil affects supply and not demand, so prices of tickets will remain the same.
c) An increase in the price of a ticket will not cause a decrease in demand, but rather a decrease in quantity demanded.
d) A decrease in demand will shift the curve rightward, not leftward.