The answer is A. The program prints:
[48, 24, 9, 8]

Why?
sort() puts the list in order, smallest first. reverse=True flips it, so the biggest comes first. It changes the list itself.
The code again
scores = [8, 48, 9, 24]
scores.sort(reverse=True)
print(scores)
Try it: change one number in the program and predict the new output before you run it.