What sentence from the passage best supports the generalization that Maria Mitchell was avalued member of the Vassar faculty?
"Through this organization, she promoted the idea of women in science and
medicine."
"The college trustees, however, granted her an indefinite leave of absence
instead."
"She taught her students by including them in her astronomical work."
"In 1857, Mitchell traveled to Europe, where she visited numerous
observatories and met leading scientists..."