The correct answer is: "decreased automobile sales ".
Imposing a tax on purchasing a good (automobile) means adding a quantity to the amount charged, therefore the price charged for the product in the market rises.
According to the law of demand, the price is inversely related to the quantity demanded, which is the amount that consumers are willing to buy at a certain price. Therefore, if the price rises due to the imposition of the tax, the amount demanded by consumers will decrease.