Mr Barton's Fifth-Grade Class Has Just Entered the Cafeteria for Lunch

Mr. Barton's fifth-grade class has just entered the cafeteria for lunch. Which of the following statements about forming a "lunch line" will most likely promote a positive relationship between him and his students?

A) "You better make a line if you want to go outside after lunch."
B) "If you don't line up properly, we'll go back to the classroom."
C) "Remember our rule about lining up when we enter the cafeteria."
D) "I'm sick and tired of your inability to form a line."