Chinses Test: What are you eating?(Beginner)

Nǐ zài chī shénme  a?
Lisa: 你  在  吃     什么  啊？
          Wǒ  zài chī  kǒuxiāngtáng.
Emily:  我   在   吃      口香糖。
What does Emily say in this conversation?

A: She’s eating an apple.

B: She’s eating a piece of bread.

C: She’s chewing gum.