Answer: Python Puzzler #3285

The answer is D. The program prints:

zap!boop!pong

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 = ["zap", "boop", "pong"]
print("!".join(sounds))

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