The power of theories lies in their ability to:
a. provide guidance on how to test hypotheses statistically.
b. minimize the number of words required to explain phenomena and, thereby, eliminate semantic problems.
c. prove that relationships exist among the phenomena studied.
d. articulate the nature of relationships among phenomena.

d. articulate the nature of relationships among phenomena.

Explanation:

The power of theories lies

A theory is the abstract generalization which systematically explains relationships of the phenomena, but does not prove these relationships conclusively . Schematic models (or conceptual maps) are graphic representations of the phenomena and the interrelationships using the diagrams and symbols and with the minimal use of words . Grand theories describes the large segments of the human experience , but this is not true of all theories .