As a Science,economics Is Disadvantaged in That

Multiple Choice

As a science,economics is disadvantaged in that

A) some economic variables are determined within the theory.
B) economic variables do not change enough to provide reliable data for testing hypotheses.
C) it deals with human behaviour and thus is not open to empirical testing.
D) it is usually not possible to conduct controlled experiments in economics,in contrast with certain other sciences.
E) economic hypotheses cannot be accepted with complete certainty,by contrast with the other sciences.