I believe that is an imperative sentence because it is giving a command.
Dramatic Irony—When the audience or reader knows something that one or more of the characters doesn't.
Situational Irony—Events or situations become ironic.
I would think it to be B. A, C, and D all have something to do with words whereas B is math which isn't quite the same.
Answer:
First, she demonstrates that she knows how to read. Second, she demonstrates that she knows how to write. Third, she tries to offer an explanation for Walter Cunningham's behavior when Miss Caroline tries to give him money for lunch.
Explanation: hope this some what helps