Answer: Python Puzzler #1026

The answer is D. The program prints:

[0, 3, 6, 9, 12, 15]

Checked by running the program for real.

range(0, 18, 3) counts from 0 in steps of 3 and stops before 18.

print(list(range(0, 18, 3)))

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