Answer: Python Puzzler #1272

The answer is B. The program prints:

[3, 6, 9, 12]
What the program prints
Checked by running the program for real.

Why?

range(3, 15, 3) counts from 3 in steps of 3 and stops before 15.

The code again

print(list(range(3, 15, 3)))

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