[单选题]
1. Which of the folloxi,)t5kjwoi q) jl18u wing are involved in the loss of heat from the bo-ip+qkd* jq .mdy of a mamiqjm+ k-*pd .qmal?
I. Erection of skin hair.
II. Vasodilation.
III. Vasoconstriction.
IV. Respiration in brown adipose tissue.
A. I and II only
B. II and IV only
C. II only
D. I, II and IV only
