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:
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Answer: 1. because they use different word for the same things and they did not communicate with the other types of spanish.
2.no
Explanation:
2. no because there are many different countries that speak spanish and most speak them differently.