What is the main idea in this selection?
 A
 A celebrity chef makes a difference by helping people
 eat more healthfully.
 B
 Students eat more healthful food when they are involved
 in developing menus for school meals.
 с
 Students discover that school lunches can be both
 healthful and delicious.
 D
 A motivated chef criticizes parents for what they allow
 their children to eat.