What is associated with increased levels of immune activity

A)  increases in stress
B)  pessimism 
C)  Type A personality
D)  high levels of social support

Immune Activity

The actions and processes through which the immune system protects the body from diseases and infections.

Social Support

The assistance and comfort received from friends, family, and others, contributing positively to mental and physical health.

Type A Personality

A temperament characterized by high levels of competitiveness, self-drive, impatience, and a constant sense of urgency.