S can’t lecture first, because T goes before S. So A is wrong.
B is CORRECT. This scenario shows one possibility that obeys all the rules.
W can’t lecture first, because P comes before W. So C is wrong.
D is wrong. Y can’t lecture first, because of the sixth rule. Here it is again:
If Y is first, they are before V. So then P must be first, not Y.
E is wrong because V must be before Z.
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