For this question you should think about which rules link two people.
We know that if the geologist learns a language then the historian learns a language. So the geologist can never learn more languages than the historian.
The historian always has to have Y. So the historian will always have more languages than the geologist. If the geologist has S and T, the historian will have Y, S and T.
If the geologist has just one of S or T then the geologist will have Y and one of S or T.
B is CORRECT. The geologist learns fewer languages than the historian.
A and C are proven wrong by this scenario:
D is proven wrong by that same scenario as well. We can give R to the linguist or the paleontologist. Either one of them could have more languages than the other.
E is proven wrong by this scenario. The paleontologist has more than the historian:
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