Answer: Python Puzzler #3014

The answer is D. The program prints:

pong...byte...ping...bit

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 = ["pong", "byte", "ping", "bit"]
print("...".join(sounds))

Try it: change one number in the program and predict the new output before you run it.