Answer: Python Puzzler #1255

The answer is B. The program prints:

[1, 5, 9]

Checked by running the program for real.

range(1, 13, 4) counts from 1 in steps of 4 and stops before 13.

print(list(range(1, 13, 4)))

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