Final answer:
The correct answer is 'OA. digo'.
Step-by-step explanation:
The correct answer is OA. digo. The question is asking for the correct form of the verb 'decir' (to say) in the first person singular form. 'Yo siempre' means 'I always' and since 'decir' is an -ir verb, the first person singular form is 'digo'
Learn more about Spanish verb conjugation