The correct option is D courage
The given passage speaks about moral courage and physical courage, and how important they are. "All virtues become meaningful because of courage", without which those virtues aren't virtues at all. The answer is option D as it's given in the first two lines of the passage "Courage is not only the basis of all virtue; it is its expression. Faith, hope, charity and all the rest don't become virtues until it takes courage to exercise them." These lines state that courage is the basis of all virtues, and a virtue is meaningful only when you have courage to exercise that virtue. The line "Faith, hope, charity and all the rest don't become virtues until it takes courage to exercise them" clearly states that these three, options A, B and C are virtues themselves, and not one of them is meaningful because of the other, they all become meaningful because of courage. Hence options A, B and C are incorrect.