Which words used in "teens, your brain needs real food" are most important to understand when it comes to how the brain transmits information?
a. by the comparison of the various kinds of carbohydrates and their effectivenessb. by the descriptions of the different types of carbohydrates and their effectsc. by the explanations about how carbohydrates change brain functionsd. by the inclusion of the most and least effective times to consume carbohydrates