A tax imposed by the government on basic goods is two cents on each can of edible oil sold. Tax records show that despite the stable per capita quantity and strong enforcement of tax laws, the amount of edible oil taxes in the first two years still dropped significantly. Which of the following is most helpful in explaining the decline in edible oil taxes? ['Few households start producing their own edible oil after the tax increase.', 'Businessmen start selling oil in bigger can than before after the tax law came into effect.', 'Two years after the introduction of the edible oil tax, the government began to levy taxes on many other basic commodities.', 'Edible oil cans are traditionally used as wedding gifts. After the implementation of the tax law, the use of edible oils as gifts has increased.']