In a test experiment of a brain health product, the first group of subjects took the health product daily, while the second group did not. The results showed that the brain cognition of the first group of subjects was indeed better than the second The group of subjects is good. Therefore, experiments have proven that this health product does have a significant health effect on the brain. Which of the following, if true, would best support the above conclusion? ['Before the test, the brain cognitive ability of the two groups of subjects was equivalent.', 'The ingredients in this brain health product are also found in some daily foods.', 'The number of subjects in both groups is equal, and the family financial ability is similar.', 'The brain-building product has been licensed for production and sales and has achieved a good market share.']