Which of the Following Are Reasons That Shivering Raises Body

Which of the following are reasons that shivering raises body temperature? (Check all that apply.)

A) Shivering decreases warm blood flow to the core while increasing flow to the muscles.
B) Shivering depresses metabolism.
C) Shivering increases heat production up to 18 times that of resting levels.
D) The process of muscle contraction produces heat.