Answer: Python Puzzler #910

The answer is B. The program prints:

[34, 23, 10, 4, 2]

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 = [10, 34, 23, 2, 4]
scores.sort(reverse=True)
print(scores)

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