Answer:
B. She thinks of herself as silly.
Step-by-step explanation:
Option B is the correct answer.
The use of the word "prattle" actually shows that she thinks of herself silly. To prattle simply means to make a sound or talk something that is foolish, silly or childish.
So, as she said "But I prattle...", this shows that she sees herself to say or utter things that are silly thereby seeing herself as silly. This means that she sees all that she has been saying as silly and childish.