In a Study at Stanford University by Walton and Cohen

In a study at Stanford University by Walton and Cohen (2011) ,what was the result of a one-time treatment that framed the stress of fitting into the college experience as common and limited in duration?

A) It significantly improved the grade point averages (GPAs) ,happiness ratings,and health of European American students at Stanford University 3 years later.
B) It significantly reduced the grade point averages (GPAs) ,happiness ratings,and health of just European American students at Stanford University 3 years later.
C) It significantly improved the grade point averages (GPAs) ,happiness ratings,and health of African American students at Stanford University 3 years later.
D) It significantly reduced the grade point averages (GPAs) ,happiness ratings,and health of African American students at Stanford University 3 years later.