Which phrase from Anne's diary supports the theme that her optimistic spirit supports her through many difficulties?

A. She wonders "why we are carrying on with this long and difficult war."

B. She compares herself to "a songbird whose wings have been clipped."

C. She jokes that "stupid grownups" would "do better to start learning" before speaking to younger people.

D. She describes life in the Annexe as "a dangerous adventure, romantic and interesting."