In Following the Principles of the Scientific Method, a Theory

Multiple Choice

In following the principles of the scientific method, a theory proposed to explain a given phenomenon must

A) agree with and build on previous theories but need not explain all observations because some of the observations may be erroneous.
B) predict new and different experiments that will extend the scope of the theoretical understanding but need not explain all the previous observations because no theory is expected to explain everything completely.
C) explain all previous reliable observations in a consistent manner but need not suggest new tests for the theory because a theory should be complete in itself.
D) explain all known reliable observations and predict new experiments and observations.