Answer:
IS A
Explanation:
because since Juan has a lot of work, as the question says, the correct answer would be that he is busy, and option A is the one that says that he is very busy. I speak Spanish and it makes sense to me
D: ¿Te gusta vender los collares?
Gustar conjugated is still one word so it cannot be "gust a"
A verb ("vender") is singular so you cannot use "gustan"
A verb after gustar has to be infinitive
so the correct answer is ¿Te gusta vender los collares?
Despues yo voy hacer un essay