Recall that we're looking to pick the answer choice that shows where the researcher's reasoning is most vulnerable.
(C) says, "It can be determined from the data that rats who are deprived of one of their sources of sensory stimulation become more reliant on kinesthesia than they had been, but the data do not indicate how such a transference takes place."
The problem with (C) is that we can conclude this answer choice from the data, so the answer choice is flawed to begin with. Thus, it doesn't highlight a flaw of the researcher's reasoning since it's already flawed, so we can get rid of this choice.
(B) says, "The possibility that the interaction of kinesthesia with at least one other sense is required for maze-learning cannot be ruled out on the basis of the data above."
(B) picks up on where the researcher's reasoning is most vulnerable. The researcher has not eliminated other senses, such as touch and taste. It's possible that it's kinesthesia, but it's also possible that it's kinesthesia combined with another sense, such as taste. Thus, (B) is the correct answer choice.
Does this make sense? Let us know if you have any more questions!
