Yeahh Letter A is correct
<span>She (pronoun) pens (verb) her (pronoun) letters (noun) very (adverb) neatly (adverb).
A pronoun is there in place of a noun. A verb is an action word, meaning it describes the action of the noun. An adverb is in a sentence to help describe the verb. A noun is a person, place, or a thing.</span>
Just before chapter 17 of To Kill a Mockingbird. Hope it helps sorry if it don't.