Which of the following are means by which the body temperature of an organism is increased? I) perspiration II) piloerection (hairs standing up) III) vasoconstriction (constriction of blood vessels) IV) vasodilation (dilation of blood vessels) V) muscle contraction Select your answer from the following: 

a. I only. . 

b. II and IV only. 

c. II, and IV, and V only. 

d. I and IV only. 

e. II, III, and V only.