A is wrong because the linguist learns S and T. That doesn’t leave any languages for G to learn.
B is wrong because the linguist learns S and T. There is no languages for G to learn.
C is wrong because the historian always has to learn Y.
D is CORRECT. This scenario proves it could be true:

E is wrong because the paleontologist learns S and T. There are no languages for the geologist to learn.

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