Answer:
Humming is a tune and melody and singing is a tune, melody, and words.
please tell me if im wrong but hope this helped.
The answer is A. The narrator is invited to dinner in remembrance of an event that occurred some time ago in which the Time Traveler announced he created a time machine. The Time Traveler then arrives, ragged and dirty. After cleaning himself up and eating he recounts his story those who were invited including the narrator. I hope this helps!<span />