The cost of manufacturing automobiles is considerably greater in Esteria than in Kurdistan. In order to stimulate Esterian consumers' purchases of domestically manufactured automobiles, the Esterian government has historically charged taxes on automobiles manufactured in Kurdistan. Five years ago, however, the Esterian government dropped those taxes; in those five years, the number of workers employed in Esterian automobile factories has decreased by 30%. Therefore, the number of vehicles manufactured and sold in Esteria must have decreased in the last five years.

Which of the following, if true, most weakens the argument?

A. Many Esterian automobile manufacturers operate factories outside Esteria.
B. The number of automobile workers in Kurdistan has not increased during the same period.
C. Because vehicles manufactured in Esteria have a reputation for high quality, many Esterian consumers have continued to purchase domestically manufactured vehicles since the tax was abolished.
D. Esterian automobile manufacturers have lowered the price of their automobiles so as to remain competitive with the manufacturers in Kurdistan.
E. Recent innovations in automated automobile-manufacturing technology have approximately halved the number of worker-hours required to produce most automobiles.

The OA is E

Source: Manhattan Prep