In the Context of Conducting Experiments in Natural Settings,random Assignment

Multiple Choice

In the context of conducting experiments in natural settings,random assignment of participants to conditions is

A) usually perceived by possible participants as the fairest procedure.
B) the fairest procedure if the effectiveness of the treatment is not known.
C) the fairest procedure if the effectiveness of the treatment is known.
D) usually perceived by those in positions of authority as the fairest procedure.