Answer: Python Puzzler #1218

The answer is C. The program prints:

[40, 34, 19, 18, 15, 3]

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 = [3, 40, 15, 34, 18, 19]
scores.sort(reverse=True)
print(scores)

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