Juan wants to find out the percentage of students in his middle school who like to watch soccer. Which of the following strategies should he use?
A Ask a random group of people playing soccer after school.
B Divide the number of players on the soccer team by the total number of students in the school.
C Invite people to watch a soccer game at his house and record the percentage of people who come.
D Ask a random group of students from each grade as they enter the cafeteria for lunch.