The Author Suggests the Following Approach for Picking a Theoretical

The author suggests the following approach for picking a theoretical orientation:

A) pick your favorite theory and stick with it because it is likely to meet the needs of all of your clients just by the nature of being in this book.
B) approach each theory with an attitude of searching for its most wide and useful parts.
C) appreciate that every theory is universally useful.
D) choose a theory that has been most effective for you in your personal work.