Research Exposing Subjects to the Virus That Causes the Common

Research exposing subjects to the virus that causes the common cold (Cohen et al., 1997) demonstrated that

A) the lower the individual's socialisation, the lower the chances of contracting a cold.
B) the greater the individual's socialisation, the lower the chances of contracting a cold.
C) the extent of socialisation and chances of contracting a cold were unrelated.
D) the quality of social contact predicted whether the individual would contract a cold, but the frequency of social contact did not.