Final answer:
Around 9 liters of fluid are secreted by the small intestine daily, not precisely matching any of the answer options, but 10 liters is the nearest approximate choice.
Step-by-step explanation:
Approximately 9 liters of fluid are secreted by the small intestine each day. This includes 2.3 liters ingested in foods and beverages, with the rest being from gastrointestinal (GI) secretions. About 90 percent of this water is absorbed in the small intestine, thanks to the concentration gradient of the water between the chyme and epithelial cells. Considering these facts from the reference information and the options provided in the question, it appears none of the answer choices precisely match the information given. However, 'b) 10' would be the closest approximation.