Options C,D and E can easily be eliminated for they have a lot of irrelevant Information.
Option A - Casts doubt to an extent to say that it was not only the verbal language but also the signs. Thus it could not have been only English language of the commands that the dog understood.
Option B: Strengthens because Hans doesn't respond to other languages but does only to the one Adam uses, which I assume, though it is not explicitly mentioned in the premise, is English.
Thus Option A.
Option A - Casts doubt to an extent to say that it was not only the verbal language but also the signs. Thus it could not have been only English language of the commands that the dog understood.
Option B: Strengthens because Hans doesn't respond to other languages but does only to the one Adam uses, which I assume, though it is not explicitly mentioned in the premise, is English.
Thus Option A.
.jpg)
