Human digestive system — practice question

Scientists estimated the surface areas of the internal walls of several parts of a healthy human digestive system. Which region is the small intestine?

• A$0.25\,\text{m}^2$
• B$0.75\,\text{m}^2$
• C$2.00\,\text{m}^2$
• D$32.00\,\text{m}^2$