What Advantage Does a Reference Check Have Over a Resume

What advantage does a reference check have over a resume in terms of gathering a candidate's behavioral information?

A) It is more likely to reveal a candidate's weaknesses with respect to job performance.
B) It is a better way to assess a candidate's past accomplishments.
C) It offers a more comprehensive view of a candidate's extracurricular activities.
D) It will give a more accurate view of a candidate's goals.