This question places H’s oil on wall 2. Let’s draw that. There are no rules for whether to place H up or down; it only matter who we match them with. Here I’ll draw them up, in order to leave more space for drawing “not” rules below

Here’s somme things we can deduce about the lower painting:
- Since H is an oil, the lower painting must be a watercolor (rule 1).
- It can’t be H’s watercolor, since that is already on wall 4. (Also, H can’t go with H, rule 2)
- It can’t be G’s watercolor, since that’s already placed with F’s oil (rule 4)
So, only I’s or F’s watercolor can go on wall 2 with H’s oil. This is a could be true question, so E is CORRECT.

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