Which Statement Is True

Which statement is true?

A) Thermogenin uncouples proton movement from production of ATP.
B) In humans, brown fat is found in babies but not adults.
C) During nonshivering heat production, metabolic fuels are consumed and heat is released by production of ATP.
D) Thermogenin is a protein found in the brown fat cells of birds and mammals.
E) Brown fat occurs only in mammals that hibernate.