I found this question hard. I eventually figured out what I was missing: I had forgotten that at least four employees must be selected.
This question places Y out. That also forces W out. You can draw this as an in-out diagram, it may help you to keep track:
We need at least four variables in. I’ve drawn that as a reminder in this diagram, but I won’t always repeat it.
So, Y and W are out. Since we need at least four employees in, we can have, at most, two more employees in the out group.
The answers ask who can’t be placed in. The right answer will be an employee that forces more than two other employees out if they are in.
That’s M. Refer to the diagram, look at “M in”, and you’ll see that O, P and S must be out. That’s five people out total, which is too many:
E is CORRECT.
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