The school food service wants to increase the number of students who eat hot lunch in the cafeteria. SGA has been asked to conduct a survey of the student body to determine the students' preferences for hot lunch. They have determined four ways to select students to complete the survey. Which method will produce a random sample?

A: Survey the first 20 students in the lunchline

B: Survey every other student as students enter the school in the morning

C: Survey all the girls in their math class

D: Survey all the students in the carpool lane