The correct answer is the last option - “Most people,” I told him, “believe anything they hear on television or see on the Web.”
First of all, there has to be a comma after people. That comma is followed by quotation marks. Then you have the rest of the sentence (I told him), followed by another comma (before another quotation marks.) And finally, there has to be a period within the quote, before the final quotation marks.
If this is a !multiple choice questions I would say B. Observe all the characters of the story from the outside. I hope this helps and I got it right. Good luck!