Esta piña es mi piña. correct incorrect

The sentence written in the exercise is:

- Correct.

Explanation:

In the sentence, is used a demonstrative that in Spanish is "ésta or esta" (how is a severe word, the accent mark could be in the vowel or not), but the demonstrative "esa" could be used because is for singular subject too, next use the substantive "piña" in singular form, the conjugated form of the verb "ser" in Spanish "es" that applies for a substantive in singular form, and the possessive adjective "mi", mentioning the fruit owns to the noun "yo" or "I" in English, though could be any demonstrative and select how owner any person.

answer is a: las

explanation:

the reason for this answer is becouse it's a plural frase which talks more then one thing