In addition to citing direct quotations, a researcher should also cite or attribute facts he has learned from a source that is not common knowledge. Of the choices, which sentence MOST needs a citation?

a (1) Emily Dickinson is regarded as one of the greatest American poets.
B) (2) She was born in 1830 in Amherst, Massachusetts, to a very prominent family.
C) (5) In her latter years, she wore only white and would not let anyone but her family see her.
D) (12) Her unusual use of capitalization and punctuation and her use of irregular meter and rhyme make her poetry unique.