Answer: Python Puzzler #1081

The answer is B. The program prints:

[13, 15, 20, 30, 37, 38]

Checked by running the program for real.

sort() puts the list in order, smallest first. It changes the list itself.

scores = [30, 37, 38, 13, 15, 20]
scores.sort()
print(scores)

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