Emphasize that you were the one who made the final decision to enroll in the course. While you may discuss others advised you on the choice, your answer showcases your decision-making skills. Try to avoid mentioning that you enrolled in the course because of potential financial.
You'll also stray from failure once you properly set your career goals. Most importantly, when you study for your future career, you'll have the motivation to stay on the right track, learning new things about your career every day. This can inspire you to do more and keep going.