This question places F’s oil on wall 1. Rule 4 says that G’s watercolor must go with F’s oil. So, we can draw both of those:

As we saw in the setup, there are only four variables left to place:

Only A and B mention these variables. And A is wrong, because wall 4 is already full.
So, B is CORRECT. G’s oil can go on wall 2.
All the other answers mention variables already placed on the diagram above.

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