Read the sentence from paragraph 2.

My mistress was, as I have said, a kind and tender-hearted woman; and in the simplicity of her soul she commenced, when I first went to live with her, to treat me as she supposed one human being ought to treat another.

What is the antecedent for the pronoun she in this sentence?
Responses

mistress
mistress

simplicity
simplicity

soul
soul

human
human