The answer is D. The program prints:
[7, 13, 21, 22, 31]
This answer was checked by running the program for real.
Why?
sort() puts the list in order, smallest first. It changes the list itself.
The code again
scores = [21, 31, 13, 7, 22]
scores.sort()
print(scores)
Try it: change one number in the program and predict the new output before you run it.