Which of the Following Is an Example of Obedience,as Defined

Which of the following is an example of obedience,as defined by social psychologists?

A) a soldier shoots enemy women and children on orders from his commanding officer
B) people clean their own table in a restaurant that has a sign reading,"Please help keep costs down by cleaning your table"
C) passengers move to the back of the bus to make room for other riders
D) Stan has thrown away all of his old ties and bought new ones to "be in style"