When Participants Were Subject to a Short-Term Stressful Task (A

When participants were subject to a short-term stressful task (a memory exercise) ,which result was observed?

A) Immune system functioning declined,as measured by blood levels of histamines and basophils.
B) Immune system functioning improved,as measured by blood-oxygen levels.
C) Immune system functioning declined,as measured by red-blood cell count.
D) Immune system functioning improved,as measured by markers in saliva.