You are on the right track, because B is not the right answer. Maybe you just had a typo, so I will explain why B is wrong and C is right.
The author makes a point about radios in order to draw a conclusion about human consciousness. This cannot be considered an example/counterexample, because it has nothing to do with the original topic. It is better described as an analogy. This is an important distinction that is likely to come up on argument structure questions. Also, we have no evidence to say that the given view is "widely accepted." It only says, "some people infer."
The format of this argument is basically: Some people have a certain belief. But they would have a contradictory belief about analogous situation. Therefore their first belief requires more evidence.
This is best expressed by C. Sometimes it helps to put the argument in your own words, as simply as possible.
