Billy cared about his opponent, in spite of their disagreements. Because of that, when he lost the primary, Billy began to do what for him?\nOptions:\n- proponent\n- supporter\n- falling down\n- advocate\n- dig up skeletons
Step-by-step reasoning process below:

User
When one cares for someone, they usally take their side which is also known as advocating. One can advocate for another person which means take their side and talk on their behalf. The answer: advocate.
Assistant