34 LR Two Question 17
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i was stuck between C and D, and choose C unfortunately. what makes C wrong ? it seemed right to me when i negated it.

Yeah, I can see that. Problem is that the claim of the argument is too small to need (C).
Here, we're making two claims:
1. That the fact they use sounds does not prove that they are referring to objects, and;
2. That because we don't know whether they're referring to objects, we don't know whether they have language.
Obviously (C) is dealing only with claim 1.
But to say that Thing A doesn't prove Thing B, it isn't necessary to assume that Thing A is not Thing B.
For example, I can say that my wife giving me a high-five doesn't prove that she loves me (because lots of people give me high-fives, even though they don't love me [WHY THOUGH? I'M SO LOVABLE!]).
But saying that does not require me to assume that when my wife gives me a high-five, she doesn't love me.
Same thing here.
Make sense?