Answer: Python Puzzler #1102

The answer is C. The program prints:

ping...byte...beep
What the program prints
Checked by running the program for real.

Why?

join glues the items of a list together, putting ‘…’ between each pair.

The code again

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

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