Question 5 - Analytical Writing Practice Test for the GMAT

When proofreading, what is the main error that should be corrected in this paragraph?

The author’s argument could be strengthened by providing a few key pieces of evidence with his or her claim. The auther says that prices of color film decreased by 30 cents in a fourteen-year time span, but this information would have been stronger had the author been able to give statistics that showed market demands of color film remaining the same in those years. If the author had given evidence showing that there were a similar number of film retailers in the time span, this would have shown that the price decrease wasn’t due to an inundated market.

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