The correct answer is alternative A.
How = pattern adverb
IS = verb
She = subject
Explanation:
An adverbial
Is a structure (word, phrase, or clause) that modifies a verb, adjective, or another adverb; it can describe the when, where, why, or how of the word it modifies. In this sentence pattern, the main adverbial always modifies the be verb.
A verb
Is a word used to describe an action, state, or occurrence, and forming the main part of the predicate of a sentence.
Subject pronouns
Are those pronouns that perform the action in a sentence. They are “ I, you, he, she, we, they” and who. Any noun performing the main action in the sentence, like these pronouns, is a subject and is categorized as subjective case.
Hope to help with my answer!
[tex]\boxed{Good\;\;Studies}}[/tex]