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The 1st hypothesis says that to control the pace the beetle has to stop and 2nd one is because they go blind because of running so fast.
statement 3 supports the 1st one because once intervals r fixed the beetle can increase the pace nd then control it at the end of each interval. whereas for the beetle to blind I guess it might be to do more with the direction, which is not mentioned and thus the statement undermines it.
DOnt know if this explanation stands, but ne one can explain it better would be glad to read it.
choosing C after much deliberation...this is what I think although not 100% sure...
The answer should give a reason why one of the two hyphothesis is chosen over the other. In C it is specified that the beetles actually increase their pace when the prey starts moving away. This shows that the first hyphothesis that the beetle cannot maintain the pace is not true. So C allows us to choose the second hyphothesis.
In the case of A it basically tells us that the beetles can run back without stopping but this causes us to doubt both the hyphotheses