The answer is B. The program prints:
byte...pong...bit...ping
This answer was checked by running the program for real.
Why?
join glues the items of a list together, putting ‘…’ between each pair.
The code again
sounds = ["byte", "pong", "bit", "ping"]
print("...".join(sounds))
Try it: change one number in the program and predict the new output before you run it.