There are three possible correct answers to this question because there are three theological virtues. St. Paul defined these virtues. The first is faith. Having faith is believing in God, as well as believing in his word as truth. Believing in him allows one to obey him.
The second virtue is hope. Hoping is the belief that everything will be okay. It involves never giving up and always believing in God to work things out. The last virtue is charity. Acts, like volunteering at a foster home or giving to the homeless, are acts of charity. They show that we love God and others more than we love ourselves.