Remember from the setup that J and L must go together. L can only go Wednesday or Thursday. So if L is not Wednesday, they must go Thursday and we get this diagram:
If you’re unsure why this diagram must be true, review the rules and the setup. The idea that JL are before ON is the key to the entire game.
E is CORRECT.

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Cant it be J or O? Why is it J? The question asks if L doesn’t lead a Wednesday session then who must lead Thursday. Wouldn’t lead mean morning session?
No lead refers to the session. As in I lead a morning session, you lead the afternoon session. Think of it this way: lead = teach
It’s just another way of saying L isn’t on Wednesday.
Wonderful! Thank you