PT 60 S3 Q5

Dogs learn best when they are trained using both voicecommands and hand ... ...

The claim that dogs learn best when they are trained using both voice commands and hand signals figures in the argument in which one of the following ways?
(A) It is an explicit premise of the argument.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, June '10 LSAT (PT 60 Sec. 3)