Answer: Python Puzzler #1055

The answer is D. The program prints:

beep-pong
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 = ["beep", "pong"]
print("-".join(sounds))

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