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If the winner of a promotional contest is selected by a lottery, the lottery must be fair, giving all entrants an equal chance of winning. Since 90 per cent of the winners selected by the lottery in a recent promotional contest submitted their entry forms within the first 2 days of the 30-day registration period, it is clear that this lottery did not meet the fairness requirement.

Which one of the following, if true, most strengthens the argument?

A. The family members of the organizer of the contest were not permitted to participate in the contest. - WRONG. Purely weakens.
B. The manner in which the contest winner would be selected was publicized prior to the selection of the winner. - WRONG. Opposite to the claim made. Weakens somewhat.
C. The contest entry forms were submitted at a consistent rate throughout the registration period. - CORRECT. If so, then there is an equal likelihood of everyone being picked up fairly but that's not the case in reality. So, what makes the winners come from the first 2 days of registration. This question still persists and thus strengthens the blue text in the passage.  
D. The rules of the contest were posted conspicuously by those who organized the contest. - WRONG. Only if someone does know the meaning of this word he/she would get it wrong. Prior to that C is misunderstood is also a necessary condition for him/her to get it wrong.
E. The number of people entering the contest far exceeded the expectations of the contest organizers - WRONG. Neutral case. Doess nothing to the passage.

Answer C.
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Trying the strategy of identifying gaps in the argument:

The argument concludes that the lottery did not meet the fairness requirement.
The premise is 90% winners were selected from the first 2 day applicants. (entry forms)
Now we have a gap in logic as we are comparing Entry Forms and Fairness Requirement.

To Strengthen we usually ensure that the gap between Premise and Conclusion is reduced. Only Option C talks about both.

This method can help you to eliminate smoke screen options quickly.
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