noxious: harmful or injurious to health or physical well-being is <em>denotative</em> meaning. Option B is the correct one.
<em>To denote</em> means to represent. This refers to an objective meaning of the word. Noxious means poisonous. The meaning <em>harmful or injurious to health or physical well-being</em> is synonymous with poisonous. For example, smoking is <em>noxious.</em>
<em>To connote</em> means to add feelings or subjective interpretation to a word. For example, " The <em>noxious</em> look on her face made us feel uncertain."
Atticus was threatened and his children were treated poorly by their peers, because he had the courage to stand up for the oppressed. Harper Lee's main message to the readers is not to treat others according to who or what they are but according to their behaviours.