My brain was and still is incapable of comprehending wtf the stimulus was trying to say, with that said, thank God answer choice C was there.

This actually makes sense.. a lot of sense.

I based the "lawgic" of this question on the understanding that small vacuum tubes contained semiconductor components.. oopss

IF that were to happen - which I highly doubt, I would, in that case, deduct answer choices based on strong language. The stronger the AC, the more unlikely for that to be the answer. Because again, in casual questions, the conclusion is a hypothesis. Therefore, it cannot be certain or must be true.

This is MY opinion.

the condition is not "only", it is "the only", which is a suff. condition.