What the Text Authors Dub the "Exhaustion Theory" of Integration

Multiple Choice

What the text authors dub the "exhaustion theory" of integration suggests that:

A) there are too many competing theories of therapy for any one person to recall and use.
B) there are so many theories of therapy that there are no new ideas left around which new theories can be organized.
C) the proliferation of therapies reached its maximum point in 1985,and is now on the decline.
D) new theories of therapy are still emerging and no one textbook can cover them all.