In Ellen Langer's Research on Mindless Compliance, in Which Condition(s)

In Ellen Langer's research on mindless compliance, in which condition(s) were participants most likely to allow another person to cut in front of them to use the copier?

A) when the person didn't give a reason for needing to use the machine
B) when the person explained that they were in a rush
C) when the person said they needed to make some copies
D) There was no difference in compliance rates as long as the person gave a reason for needing to use the machine.