Which of the following statements are 对 about Peter Winch’s idea that theoretical propositions are “constitutive of the phenomena” of the social science? ( )
选项：

A:When we single out a phenomenon and define it in a certain way, we create the world in which we live.
B:Theoretical propositions are very important for the development of social science.
C:The labels we give to phenomena come to be self-fulfilling.
D:Social scientists must be careful with theoretical propositions.