The answer is B. The program prints:
[6, 9, 12, 15]
This answer was checked by running the program for real.
Why?
range(6, 16, 3) counts from 6 in steps of 3 and stops before 16.
The code again
print(list(range(6, 16, 3)))
Try it: change one number in the program and predict the new output before you run it.