c .es would be my answer , but b also applies if you are talking to him directly and saying it as a compliment , c would be if you are just talking about him to someone else
Question 1 : A ti Te Gustan Los Dias de Fiesta
Question 2 : A Ellos les gusta Mucho la familia
hope this helps
B.
cuz they are spraying pesticides on plants
la liberia would be correct
