There’s an easy way and a hard way to solve this question. The hard way involves drawing each possibility. You can probably figure out the question on your own that way, but it takes too long.
The easy way is to focus on the most restricted point. Monday afternoon is hard to fill.
O and R can’t go there, because they can never go in the afternoon. K and H can’t go there, because the question assigned them elsewhere.
That’s four of our eight people who can’t go there.
G can’t go Monday afternoon, because G can only go on Tuesdays. And N can’t go there, because H and I have to go the day after N. In this case, H has to go Wednesday.
So only I and L can present on Monday afternoon. Everyone else has been eliminated. So one of I and L has to present on Monday afternoon.
All four of the wrong answers place both I and L in the mornings. They ignore Monday afternoon.
Process of elimination proves that D is CORRECT. This diagram shows how it could work:
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