Which of the following statements concerning the small intestine is true?
Select one:
a. About 90% of all absorption of nutrients occurs in the small intestine.
b. Collectively, the circular folds, villi, and microvilli double the surface area of the small intestine.
c. Chyme entering the small intestine contains completely digested carbohydrates, proteins, and lipids.
d. All carbohydrates are absorbed as disaccharides in the small intestine.