Which Statement About the Enzyme Lysozyme Is True

Which statement about the enzyme lysozyme is true?

A) A small group of closely related mammals has evolved a special form of lysozyme that functions in digestion.
B) The lysozymes found in the foregut fermenters resulted from convergent evolution.
C) Lysozyme could not have evolved a secondary function if it had been an enzyme with a vital primary function.
D) A high mutation rate in foregut fermenters allows their lysozymes to evolve rapidly.
E) Lysozymes first evolved as a defense against bacteria in the common ancestor of mammals.