Suppose a government starts taxing two cents for each can of edible oil sold. However, tax records show that despite the stable population and strong enforcement of tax laws, the tax on edible oil has shown a downward trend in the first two years after the tax law came into effect. Which of the following items, if correct, is the most helpful explanation for the decline in the taxation of edible oils. ['Few households start producing their own edible oil after the tax increase.', 'Merchants started selling edible oil in larger tanks than before after the tax law was implemented.', 'Two years after the introduction of the edible oil tax, the government began to levy taxes on many other 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.']