<h3>Esta piña es mi piña. correct incorrect</h3>
Answer: correct
Esta piña es mi piña.
This pineapple is my pineapple.
Explanation: "Esta" is a demonstrative adjective and "mi" is a possessive adjective.
Espero aprender a tocar el piano con la Sra. Fernández
Ella es baja.
bajo would be for male
and está wouldn’t make sense.