Read the conversation below and answer the question.
Emily: I had a dream last night. I was flying over the city.
Mark: That sounds amazing! I wish I could fly, too.
Emily: What about you? Do you remember your dreams?
Mark: I don't remember my dreams, but my mother says I talk in my sleep.
According to the conversation, which of the following is true?
A)Emily can fly in real life.
B)Mark remembers all his dreams.
C)Mark talks while he is sleeping.
D)Emily's mother says she talks in her sleep.