The answer is C. The program prints:
[6, 9, 12]
This answer was checked by running the program for real.
Why?
range(6, 14, 3) counts from 6 in steps of 3 and stops before 14.
The code again
print(list(range(6, 14, 3)))
Try it: change one number in the program and predict the new output before you run it.