This disease involves deterioration of the myelin sheath

Which statement best characterizes the relationship between stress and illness? a. Stress increases the number of lymphocytes in the bloodstream, which diminishes the body's ability to fight offdisease

b. Stress increases levels of adrenaline and other hormones that suppress immune cell activity and increasesusceptibility to illness. c. Stress increases the negative attributions that people make, and negative attributions can become self-fulfillingprophecies. d. Under high levels of stress, people tend to sleep too much, which weakens the immune system and makesillness more likely.

Lucia has always been what some researchers call a cooperator; that is, someone who gives freely of her time, her money, and so forth, usually irrespective of the behavior of others. Cooperators, though small in number in society, are very important because most people are ____

a. ?free riders who do not cooperate b. ?reciprocators who cooperate only after seeing others do so c. ?free riders who cooperate only after seeing others do so d. ?reciprocators who do not cooperate