Final answer:
The correct conjugation is 'escribo' for the statement 'Yo __ una carta a mi amiga'.
Step-by-step explanation:
The correct conjugation of the verb for the statement 'Yo __ una carta a mi amiga' is escribo.
This is because 'Yo' is the first-person singular pronoun in Spanish, which corresponds to 'I' in English. The verb 'escribir' means 'to write', and when conjugated for the subject 'Yo', it becomes 'escribo'.
So, the complete statement is 'Yo escribo una carta a mi amiga'.
Learn more about Spanish verb conjugation