Maybe review over the text it’s talking about. I would help but there is not text for what you are needing help with. Try putting a photo of the text your questions are linked to? Then it would be easier to help with what your asking.
The answer is C.) because of the present participle "has". If the present participle "has" wasn't in the sentence, then the answer would be B.). Anyway, the answer is C.) because of "has". (has spoken). I hope that helps :)
