You Are Participating in an Experiment That Requires You to Initially

You are participating in an experiment that requires you to initially release minute amounts of a toxic gas into a chamber where subjects are trying to solve puzzles.However,with every mistake they make,you are instructed to release greater and greater amounts of the gas.What factor would increase your willingness to continue on?

A) You didn't have to see the subjects.
B) You could have someone else release the gas.
C) You didn't have to hear the screams of the subjects.
D) All would equally increase your willingness to continue.