gmatter0913 wrote:

I marked D because the other options are completely absurd. But, I don't know how is D correct? Where did 14 come from?

This is how I arrived at the conclusion hope this helps.

Premise X: Also, most of the 20 students who read the fewest number of novels revealed below-average levels of emotional comfort.

Premise Y: that some 10 students who read the greatest number of novels reported lower stress levels and higher energy levels

Premise Z: Each of the 200 participants was asked to read at least one novel per day over the course of 12 days

D: More than 8 participants read at least 14 novels during the course of the experiment.

Now using X and Z we can conclude that 20 people read atleast 1 novel per day over the course of 12 days. Since X also says that "most of the 20 students who read the fewest ..." the number of students who read the least is 20.

Using X, Y and Z, you will see 3 lists... Greatest number of novels read, some middle group, least number of novels read. Which means worst case scenario 10(greatest read ~should be a number greater than the number that the middle group seems to have read), some middle group(~number of books read should be a number greater than 12, 20(least read ~12 books).

If there is a greatest number and there is a least number and their total doesnt add up to 200 then there MUST BE A MIDDLE GROUPTherefore option D fits directly into this conclusion we come across. Hope this answers your question