A team of efficiency consultant conducted a study of company x and found that 85% of its employees suffered a "midafternoon slump" between the hours of 2:00 pm and 4:00 pm. during this slump, each employee's productivity went down an average of 30%. the consultants recommended, therefore,
that management institute a policy encouraging employees to take their lunch breaks sometime between the hours of 2:00 pm and 4:00 pm, since employees do not need to be productive as they eat lunch.
Prethinking: Conclusion is already made bold in above argument. We have to get the assumption, so we need to think there is no other way that can lead to conclusion..
The consultant's conclusion relies on which of the following assumptions?
A. the consultants found no correlation between consumption of food and the feelings of lethargy experienced by the employees of company x during the midafternoon slump. -> Let's say, if taking food is the reason of feeling lethargy, then conclusion will fall apart. On the other side, if we say, there is no correlation between taking food and feeling lethargy, then our conclusion will stand tall. Let's keep it.
B. some of the employees of company x do not eat breakfast until they arrive at the office at 9:00 am. -> Irrelevant. Breakfast time doesn't make sense.
C. the consultants had seen the same slump phenomenon at company p, and had made the same recommendation to change the lunch hour. -> Irrelevant. Other company comparison is not useful.
D. most of the employees of company x expressed a preference to each lunch sometime between the hours of 1:00 pm and 3:00 pm. -> It may strengthen the argument, not the required assumption. Incorrect.
E. the consultant also suggested adjusting the work schedules of half of the employees of company x so that they would come in early in the morning and leave by 2:00 pm. -> Irrelevant. It is going beyond the conclusion.
So, I think A.