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C suggests that the beetle takes snap shots of the terrain everytime it pauses, and it increases its chase speed to adjust for a fleeing prey. increasing speed without shortening the chase interval suggests that stamina is not a problem.
(A) does not make sense, because the experiment does not answer the hypothesis.
(B) suggests that the beetle has no problem with visual tracking of the prey while running, but it also disputes that stamina is not a problem since running up/down hill has no effect on the beetle.
(D) does not answer the hypothesis
(E) the word "sometimes" introduces doubts into the conclusion of the experiment, so that the result of the experiment is inconclusive. BUT it does make sense in a way because it suggests that the beetles stop when they could still process visual info. BUT, the choice does not refute or support the stamina issue. The question asks to pick the choice that addresses both the visual and the stamina issues.