A billion years ago, when dinosaurs ruled the earth, a handful of nocturnal ancient reptiles found a survival strategy unknowingly, and eventually went to the evolutionary path of the brain. Scientists are very similar to primitive mammals. It was concluded from the fossil skulls of ancient reptiles that it is the development of the sense of smell that has promoted the evolution of ancient reptile brains. Which of the following, if true, would best support the above conclusion? ['Many early mammals evolved smaller bodies due to natural selection, but their brains failed to shrink proportionally.', 'The researchers analyzed the reptile canine dosaurus fossil, which is closely related to the early mammal Morgan beast, but the brain of the morgan beast is half larger than that of the canine dragon, and the area that processes the sense of smell is significantly larger.', 'Early nocturnal mammals evolved larger brains to promote their hearing, as vision does not play a large role at night.', 'Studies show that giant skulls that have the closest relationship to existing mammals have larger brain volumes and nasal airspace than earlier reptiles.']