Mrs. Bullfrog's true character is directly revealed through ...

A) her physical description.

B) her interaction with the narrator.

C) her action with the stagecoach driver.

D) her expression of her thoughts and feelings.

B) Her action with the stagecoach driver.

Mrs Bullfrog is trying to impress and give a good impression in mr bullfrog for which he shouldn't believe her words, rather her actions would discover her true character. That is why her action with the stagecoach driver reveals her actual character.