The answer is A because writing a narrative is based solely on a personal experience. A persuasive speech is more of your opinion and less about an experience.
In the poem "Mother to Son" it's very commum to use words in everyday speech, which may be different in different regions or communities. In this text we have some example as “Cause you find it’s kinder hard.”
So, the vernacular uses language gives the impression that the woman is less educated and probably from the countryside.
Because of that, the diction is <u>Colloquial.</u>
