In The Importance of Being Earnest, why does Gwendolen always travel with her diary?

(1 point)
She believes people should always have something sensational to read on the train.
She is hoping to write a three-volume novel based on her life.
She wants to be ready if she has to prove an event took place.
She wants to give it to Jack as a birthday present

She wants to be ready if she has to prove an event took place.