What is the difference between R and S? A. Both are endoplasmic reticula, but S has ribosomes involved in making proteins. B. Both are Golgi apparatuses, but R is smooth and makes fats and steroids. C. R is a Golgi apparatus, and S is a membrane-bound lysosome. D. R is a mitochondrion, and S is the rough endoplasmic reticulum.