An increase in the price of a substitute. A decrease in the price of a complement. An increase in income. A decrease in income. The above table gives the demand schedule for Billy Bob's BBQ ribs.
Comparative advantage is the ability to perform an activity at a zero opportunity cost.
Opportunity cost is best defined as the value of the next best alternative that is foregone in making a choice. There is not enough information to tell if the change increases, decreases, or has no effect on the supply of cars. It decreases the supply. It causes no change. It increase the supply.