In the Study by Cohen and His Colleagues (1998) on Susceptibility

In the study by Cohen and his colleagues (1998) on susceptibility to the cold virus, ____.

A) stress was not related to whether participants developed cold symptoms.
B) all of the subjects who became infected with the virus developed cold symptoms because they all suffered some level of stress.
C) only participants who suffered from acute stressful life events for less than a month developed cold symptoms.
D) the stressors most closely related to colds were long-term conflicts with family or friends and unemployment.