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A stain-removing agent currently available in City X can remove the most stubborn of stains from clothes but is not very popular because it leaves behind a foul smell in the clothes. It takes around 10 days for the smell to completely go away from the clothes. Another stainremoving agent has just been launched in City X which is as effective at cleaning stains as the older one. An advantage of the new stain-removing agent is that its smell starts to go away from the clothes in two days itself. Thus this new agent should easily be able to outsell the older one.

Which of the following pieces of information would be most helpful in evaluating the argument above?

(A) The rate of growth or decline in sales of stain-removing agents in city X

(B) The total number of stain removing agents sold last year in city X

(C) The per capita income of people residing in city X

(D) The amount of time it takes for the smell of the new stain-removing agent to completely go away from the clothes.

(E) A comparison of the smell of the new stain removing agent with that of similar agents available in other cities­



Official Explanation



Answer: D

The author suggests that the new stain-removing agent will outsell the older one, but takes no account of the fact that there’s a disparity in the information given. The smell of the new agent starts to wear off in two days, but we need to know how long it takes for the smell to wear off completely. Only then would we be able to compare the new and the old agents. D provides this information and is, therefore, the correct answer.

A, B, and C present irrelevant issues. Neither of these pieces of information helps us to differentiate between the two stain-removing agents.

(E) We are just comparing the two agents available in city X. A comparison with cleaning agents available in other cities has no bearing on the argument.
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