A research team brought together more than 140 non-human primate brain mass data to study why primate brains are much larger than other vertebrates. In the study, researchers not only considered the primate's Social factors, such as population size, social system, mating system, etc. , have also studied their dietary habits, that is, but they are also leaf-eating, fruit-eating, or omnivorous animals. Based on this, researchers believe that dietary habits are primates The main reason for large brain size. Which of the following, if true, best supports the above conclusion? ["Primates' dietary habits have an important effect on their body size.", 'The idea that the social factors that have been widely accepted in the past to determine primate brain volume are only a hypothesis.', 'Study results do not show a link between fruit or leaf intake and brain volume in the same primate.', 'Of the more than 140 primates, the brain volume of fruit-eating animals is significantly larger than that of leaf-eating animals; the brain volume of omnivores is also larger than that of leaf-eating animals.']