PT 15 S3 Q8

Delta green ground beetles sometimes remain motionless for hours at a stretch, ... ...

Which one of the following, if true, most strongly supports the conclusion drawn above?
(A) Because of their excellent camouflage, delta green ground beetles are almost impossible to see if they are not moving.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Stronger" Questions, Set 2