PT 47 S2 Q25

Until recently, biologists were unable to explain the fact that pathogens—disease-causing ... ...

The passage implies that which one of the following is a reason that rhinoviruses are unlikely to be especially virulent?
(A) They immobilize their hosts before they have a chance to reproduce extensively enough to pass directly to new hosts.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Science & Technology Mix 1