Answer:
I am unsure of the context but the correct answer should be: el caballo
el caballo = the horse and horses don't eat meat
Ella la compra. I don't think there are two object pronouns that can be used in this one sentence, so I would assume that the second pronoun was for another sentence.
It is A, you are saying masculine because it is several people and when there are more than one it defaults to masculine. you dont however use plural again beacuse you will be referring to the dog. if there was more than one dog you would use C. But there is only one dog, so the correct answer is A
