Answer:
However, Clara was not content to sit on the sidelines; she often risked her own life to care for soldiers wounded in battle.
Step-by-step explanation:
The sentence that contains information that could best be used to create a yearbook page about Clara Barton is the last one:
However, Clara was not content to sit on the sidelines; she often risked her own life to care for soldiers wounded in battle.
It's the only sentence that contains positive information about Barton. That is the kind of information you want in a yearbook.
The first and the third sentence contain no information about her, while the second tells us negative things about her.