1. The first question is asking you, "Do you prefer chocolate or vanilla? If you prefer vanilla respond with, "Yo prefiero la vainilla." If you preferer chocolate respond with, "Yo prefiero el chocolate."
2. The secound question is asking, "Does your friend prefer blue or red?" If your friend is a girl and prefers red you should say, "Mi amiga prefiere roja." If your friend is a boy and prefers red you should say, "Mi amigo prefiere rojo." If your friend is a girl and prefers blue you should say, "Mi amiga prefiere el azul." If your friend is a boy and prefers blue you should say, "Mi amigo prefiere el azul."
3. The third question is asking, "Do you and your friends prefer to play sports or go to the movies?" If you and your friends prefer to play sports say, "Mis amigos y yo preferimos practicar deportes." If you and your friends prefer to fo to the movies say, "Mis amigos y yo preferimos ir al cine."