Answer: The time traveller has been driven insane by visiting other times
The Time Traveller has returned to his own time, but can barely put a sentence together. It seems that he is struggling with his words and his thoughts and cannot tell if all of his adventures really happened or if he might have just imagined them. His travel is confirmed though, when they walk through the house and find the actual time machine.
Explanation:
As·ser·tion (ə-sûr′shən)n.1. The act of asserting.2. Something declared or stated positively, often with no support or attempt at <span>proof.</span>
I actually read two of those books and it was the magician's nephew and the yearling. I liked the magician's nephew better than the yearling.
Chicago........................
C, because fiction writing is typically not based on anything true