Answer: Python Puzzler #969

The answer is B. The program prints:

[6, 10, 14, 18]
What the program prints
Checked by running the program for real.

Why?

range(6, 19, 4) counts from 6 in steps of 4 and stops before 19.

The code again

print(list(range(6, 19, 4)))

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