Final answer:
Miss Caroline's mistakes, misunderstanding Walter Cunningham's situation and assuming Scout can't read, illustrate her unfamiliarity with Maycomb.
Step-by-step explanation:
The mistakes made by Miss Caroline on her first day show her lack of knowledge about Maycomb. Specifically, she makes incorrect assumptions about local families and children. These mistakes include misunderstanding Walter Cunningham's poverty situation, and she incorrectly assumes Scout can't read because of her young age, when in fact Scout is quite literate. This situation aligns with the answer choice B) She misunderstands Walter Cunningham's situation; She assumes Scout can read.