Must be false. All morally virtuous people have overcome the inclination to do the wrong thing, which means that these people are capable of doing the wrong thing––they just overcame the urge to do so.

Could be false. We know that all people who become morally virtuous achieve moral excellence, but we don’t know what quantity of people who achieve moral excellence are morally virtuous.

Could be false. The stimulus discusses those who have repeatedly overcome inclinations to do the wrong thing, not those who have no inclination to do the wrong thing. These are different ideas.

Could be false. We know that all people who become morally virtuous achieve moral excellence. (D) confuses the sufficient and necessary conditions in this relationship.

Must be true. We know that all morally virtuous people have repeatedly overcome the inclinations to do something wrong, which means that they have faced this inclination before.