Read the paragraph. People often cannot tell the difference between gerbils and hamsters. Both are small, furry, four-legged rodents. However, there are big differences between the two.

Which sentence should come next in the paragraph to best maintain the compare-and-contrast text structure?

Hamsters and gerbils need a minimum cage size of 12 x 24 inches.
Mice are also small, furry rodents like gerbils and hamsters.
Gerbils have long furry tails, while hamsters do not have tails.
Gerbils and hamsters are two animals people choose to keep as pets.