I think its C..

(C) In pursuing a moving insect, a beetle usually responds immediately to changes in the insect's direction, and it pauses qually frequently whether the chase is up or down an incline.

There r 2 theories here
a) States that insect stops because it gets tired and so needs rest
b) States that insect stops because it needs time to put in the information in its mind

C states that the prey is changing directions, so the beetle needs to stop so that it can put in the new info in its mind (proving theory B correct).It also states that the bettle pauses frequently if the chase is up or down means that when its going down ( as per gravity) it still needs to stop..Ideally if theory a is to be correct then insect should stop less during downhill and more during its journey uphill..So there's something else to it which forces insect to stop that often

so C

OA plz?

Here is why I think it is not C.

Infact C proves that both hypotheses are inorrect.
It can change course - perception is not a problem.
It usually frequently rests whether it is incline or down. - Rest is not the reson they stop. If it were true that they rest frequently during an uphill chase and less frequently during downhill chase, then the first hypothesis would be supported.

giddi
But isnt it like this

It can change course, but its stopping -so means tht its taking time to get the image of the prey into brain and thts why its stopping as its brain cant take in that much information quickly... Just as wht the premise states... If thats true then stmtm 1 is correct..

Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, a tiger beetle will intermittently stop and then, a moment later, resume its attack. Perhaps the beetles cannot maintain their pace and must pause for moment's rest; but an alternative hypothesis is while running, tiger beetles are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop.

Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypothesis and undermine the other?

(A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs away without its usual intermittent stopping.

A wouldnt be the choice as it doesnt talk of either of the two hypothesis mentioned above. However, it does come close to proving the scond hypothesis correct.
(B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
B could be a possibility because it undermines the second hypothesis and strengthes the first one.
(C) In pursuing a moving insect, a beetle usually responds immediately to changes in the insect's direction, and it pauses qually frequently whether the chase is up or down an incline.

C could be chosen over B , however, because it undermines the second hypothesis and strengthens the first as it is understood that the insect is tired chasing its prey either up or down an incline.

(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
D is ambigous
(E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.

E isnt very clear again.

what is the OA...? is it C

Please explain the reasoning of your choice.

B In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.