Unified Theory, According to Staats, Should Be Developed to

Unified theory, according to Staats, should be developed to

A) select the best aspects of various theories, however unsystematic the result may be.
B) discover the one best theory, which should be the focus of research, while the others are left to history.
C) encourage the development of several theories, which can coexist, since we cannot know at this time which theory is best.
D) combine diverse theories into one systematic whole.