Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) Intensified training in associated with increases in B cell immunoglobulin production
B) Athletes always have lower lymphocyte proliferative responses compared with non-athletes
C) Lymphocyte proliferative responses are elevated after period of training in previously sedentary individuals
D) Intensified training in associated with decreases in circulating numbers of type-1 T cells
E) Intensified training in associated with increases in circulating numbers of type-1 T cells and decreases in type-2 T cells