Correct Answer: Grass

Solution : The correct option is Grass .

The length of the small intestine in animals, including humans, is generally related to their diet. Animals that consume a primarily herbivorous diet, such as grass and other plant materials, often have longer small intestines compared to carnivores.

This is because plant materials can be more difficult to break down and require longer processing for the extraction of nutrients. Herbivores, like cows and horses, typically have a longer digestive system, including a longer small intestine, to allow for the extended processing required to extract nutrients from plant cell walls.