D. emphasizes that eating healthier food is a national concern for the welfare of students.
Explanation:
Option D is the correct answer. The author referring to the government's regulations over school food service actually emphasizes that the issue of eating healthier foods is a national concern. The government is definitely concerned about the health of the student and show that in regulating what is served to students in the schools. The regulations encouraged the serving of fruits and vegetables in the schools which have healthier alternatives.
