Answer: Python Puzzler #956

The answer is C. The program prints:

[1, 4, 7, 10, 13, 16]

Checked by running the program for real.

range(1, 17, 3) counts from 1 in steps of 3 and stops before 17.

print(list(range(1, 17, 3)))

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