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If the price of gasoline declines between 2012 and 2015, we can expect to see the demand for bigger automobiles
increase, because fuel and autos are complementary products.
remain unchanged, as only the quantity demanded for bigger automobiles will change due to a pricing change.
increase, because fuel and autos are substitute products.
increase, because supplier's input costs will decrease thereby allowing them to offer bigger automobiles at a lower price.
both A and D are correct answers.