One Has to Be Cautious About Concluding That a "Fighting

Multiple Choice

One has to be cautious about concluding that a "fighting spirit" helps one cope with stress and survive cancer because:

A) Physiological mechanisms are rarely assessed in these studies
B) Studies looking at these variables have found mostly negative results
C) The only research done in this area has been done with nonhumans
D) The studies involve cancers that are in the early stages