Which sentence from the article BEST explains how Alena wants to help people in need?

A
"I love school, I love learning, I love reading," Alena said, adding that from a young age, she has had a particular interest in STEM - science, technology, engineering and math.
B
"A big part of what I want to do is viral immunology, and I want to advocate for underrepresented communities that lack health care," Alena said.
C
Her educators and advisers encouraged her to apply for early acceptance to medical school.
D
The average acceptance rate at U.S. medical schools is 7 percent, and about 7 percent of those accepted are Black.