阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

On a cold afternoon in January 2015, Yesenia Diosdado, 11, got off a school bus in Lenexa, Kansas, near the apartment building where she lives with her family. When the  41  pulled away, Yesenia saw police and emergency workers attending to  42  of a three-car accident that had happened at a busy crossroads nearby. Yesenia  43  a small crowd of onlookers across the street.

She noticed that a(n)  44  woman was trying to  45  with an Emergency Medical Service worker using sign language, but he couldn’t  46  her. “I heard him  47  an interpreter (翻译员),” Yesenia says.

She ran over to the paramedic (护理人员) to  48  — her mother, a former sign language interpreter, had  49  her and her sisters how to  50  (no one in the family is hearing-impaired).

“She said, ‘I sign. Can I help?’” says EMS captain Chris Winger. “I was  51 .”

Yesenia was able to  52  to the emergency worker that the woman’s neck was injured and tell them the name of the local hospital she preferred. “She looked really  53 ,” says Yesenia. “I’m proud that I got to do  54  to help.”