Heating a Protein Can Cause It to Denature,or Unfold

Heating a protein can cause it to denature,or unfold.What do you think would happen to the function of a protein in a denatured state?

A) The protein would be able to continue working because only the sequence of amino acids dictates the function,not the three-dimensional shape.
B) The amino acids that make up the protein would fall apart because the bonds that hold them together are weak.
C) The protein would not be functional because the three-dimensional shape dictates protein's function.
D) Proteins do not fold,so this is unlikely to occur.
E) It depends on the size of the protein because only large proteins fold into three-dimensional shapes for functionality.