If you followed along in the setup, it’s easy to see that D is CORRECT. If Y tests H on the first day, then S has to test H on the second day. That leaves no room for T to test H.
So Y can’t test H on the first day.
This diagram proves A and C could be true.
The diagram from question 14 proves that B and E could be true. R tests J on the second day and Y tests H on the second day.
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