The nurse is teaching an adolescent girl about appropriate food choices. Which of the following best explains how to answer Questions based on cognitive development?

The correct answer is A because adolescents, based on cognitive development theories like Piaget's stages, reach the formal operational stage where they can think abstractly and plan ahead. This allows them to understand the consequences of their food choices and participate in planning their meals. Choice B is incorrect as it refers to a concept related to conservation, which is part of Piaget's concrete operational stage, not relevant to this question. Choice C is incorrect as it generalizes adolescents' critical thinking abilities. Choice D is incorrect as it underestimates adolescents' cognitive abilities, as they have progressed beyond just concrete thinking.