Two hundred randomly selected subjects were asked, “Have you ever awak

There are two groups.

The first is a random selection of 200 students. This group is asked whether they have woken up to a sense of being paralysed with a strange presence in the room. Forty percent answer 'yes'.

A second group, different from the first, is asked whether they have woken up to a sense of being paralysed. Only 14 percent answer 'yes'.

(A) Experiencing a sense of a strange presence in a room in some way causes subjects to feel as though they are paralysed.
Two problems with this choice. Firstly, It says subjects, referring to all, when only 40 percent reported that they did. Even if the 40% that did, did so truthfully and correctly, this does not apply to all the subjects. Secondly, the causality can be the other way around. The paralysis may be causing them to feel a strange presence.

(B) The number of subjects who had awakened with a sense of a strange presence in the room was greater in the first group than in the control group.
We cannot infer this as the second group was not asked about a strange presence.

(C) If the reports of the first group of subjects were accurate, approximately 60 percent of them had never awakened with a sense of a strange presence in the room.
The first group was asked whether they woke up feeling both paralysed and sensing a strange presence in the room. More than 40% could have woken up with a sense of just a strange presence in the room without the paralysis.


(D) At least some of the randomly selected subjects of the study gave inconsistent reports.
There is no basis to infer this as they are two independent groups.

(E) The tendency of subjects to report a recollection of an event can sometimes be increased by suggesting circumstances that accompanied the event.
This seems to be the case between the two groups. The first group were asked about paralysis with another factor, a strange presence in the room compared to the second group who were only asked about the paralysis. The first group reported a greater number than the second justifying this choice. The choice also uses the word 'sometimes' which can be supported by this example and does not make a generalisation, as in choice A.