I believe this argument is inductive reasoning due to not using facts that support your sentence hope this helps :)
I think the most logical answer from my research is option c.
I'm not sure, but I tried.
Check out this website: http://www.notablebiographies.com/Ch-Co/Chaplin-Charlie.html .
It's really detailed and might help you find answers to your question.
Answer:
Because when he spoke, he spoke with power and passion. And the words he spoke were non violent and comprehensive.