The answer is A. Tú tocas el piano. Because Tu tocas is the only correct way of saying you are playing the piano in this instance. C is saying "tocan" which is wrong because it's saying you but then using a the group form of playing. The same thing with B, it's also using the group form of playing and it's past tense. And D is using the I form of playing not the you form.
Answer:
a green salad
Explanation:
a green salad becuase a candy bar would make you more tired and the sugar would go down
It means:
What are the main causes of the sale of huachicol
ComER
seguIR
familiAR
cellulAR