Answer: Python Puzzler #1014

The answer is D. The program prints:

[45, 42, 39, 31]

Checked by running the program for real.

sort() puts the list in order, smallest first. reverse=True flips it, so the biggest comes first. It changes the list itself.

scores = [31, 45, 42, 39]
scores.sort(reverse=True)
print(scores)

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