Over a period of time, the equilibrium price of a good increases and the quantity decreases. All of the following could account for this situation, except:

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When the price of an alternative good or service decreases, producers may choose to shift their production towards the cheaper good or service. This would result in a decrease in the quantity supplied of the original good, and a decrease in the equilibrium quantity. However, an increase in production costs (choice A), removal of a subsidy (choice B), or imposition of a sales tax (choice C) would all increase the cost to produce or purchase the good, leading to a decrease in the quantity demanded and a decrease in the equilibrium quantity.

Over a Period of Time, the Equilibrium Price of a Good