A sample of students will be selected from all the students at a high school. Which of the following sampling methods is least likely to produce a representative sample of the students? From a list of all student names, randomly select 50 names from the list for the sample.
A

Randomly choose five classrooms in the school and use all the students in those classrooms for the sample.
B

Divide the students into the four class years (freshman, sophomore, junior, senior) and randomly select students from each year in proportion to the number of students in each year.
C

From a numbered list of all student names, randomly choose a starting point and then choose every tenth student on the list.
D

From a randomly chosen home basketball game, choose every tenth student who enters the gymnasium.
E