The human immunodeficiency virus (HIV) often infects and destroys CD4 T cells. These CD4 T cells are one of many kinds of white blood cells that are an important part of the immune system. The most common danger related to the destruction of CD4 T cells is — * A-a decrease in the amount of oxygen being transported to tissues
B-an increase in the risk of high blood pressure
C-a decrease in the flow of blood to vital organs
D-an increase in the threat of diseases caused by microorganisms and viruses