The correct answer is C) an ability to learn from mistakes.
An entrepreneur conducted many experiments in a project without success. The characteristic that this person must have to succeed is the ability to learn from mistakes.
If you want to succeed in life, one of the most important characteristics you need is to be persistent. It's very difficult to win every time, that is why you need to learn from your mistakes, be patient, and go for it again, and again. It is valid to have mistakes as long as you learn from them in order to no-repeat them again. So with perseverance, hard work and time, you can overcome any limit and have success.