Ya escribí las cartas. las cartas están a. escribidas b. escritos c. escritas

The right option that fills the sentence is:

c. Escritas.

- Ya escribí las cartas. Las cartas están escritas.

Explanation:

The translation of the sentence in the answer is:

- I already wrote the letters. The letters are written.

In Spanish there are two possible types of conjugations that can be found after the verb "estar":

Within the options it can be identified that they apply to the second case, the perfect tense, of which the following can be said:

a. Escribidas: It is a poorly written or spoken conjugation that is currently only used as irony.

b. Escritos: Correct form of conjugation in perfect time, applicable for a plural male noun.

c. Escritas: Correct form of conjugation in perfect time, applicable for a plural female noun.

As "las cartas" is a female and plural noun, the proper perfect tense conjugation is "escritas."

do you know the title of the listening so i can hear and answer this?