The Authors of Your Text Report That Researchers Exposed Some

The authors of your text report that researchers exposed some participants in a study to the virus that causes the common cold and others to saline solution.The findings from this study imply that

A) when people are under greater stress, their immune systems are weakened.
B) when people are under great stress, their immune systems are just as strong as when they are under low stress.
C) when people are under low stress, their immune systems are stronger than when they are under high stress.
D) stress level does not influence the strength of the immune system.