K and L were the two flexible variables that had no rules. So now we can only use the six other variables. And they must obey the rules. This lets us conclude a few things:
- G must be in, on Tuesday.
- O and R must be present, in the mornings.
- Nina will have to be in, likely on Wednesday.
When you make deductions, you should go through the answer choices and try to eliminate them using the easiest deduction. It’s hard to check whether G is on Tuesday, since we can only see the mornings, for example.
But it’s easy to check whether both O and R are in the answers. They have to both be there, in the morning. Only D has both O and R, so we can eliminate the rest.
D is CORRECT.
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