Answer: Python Puzzler #858

The answer is D. The program prints:

[30, 18, 15, 1]

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 = [1, 15, 30, 18]
scores.sort(reverse=True)
print(scores)

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