I need help looking for the most likely answer to this question.
__________________clinicians recommend quality self-help materials to their clients as a supplement to therapy.
a. A few
b. Rarely do
c. An overwhelming majority of
The answer to your question, to be on the absolute safe side, is A "a few". Here is why:
Conceding the description that something is "overwhelming" in academic or professional writing entails that the numbers found after applying quantitative research are off the normative standards. In other words, for any academic writing in psychology to allow itself to cite the words "an overwhelming majority of clinicians" means that such publication conducted quantitative research or a phenomenological study regarding how many clinicians approve self-help materials as an additional resource for their client. Moreover, it also means that the number of clinicians who engage in this practice is more than what is expected from popular trend within the field.
Since it is likely that such quantitative study has not yet been performed, look at its opposite, which is the option for "rarely". Again, the use of this word in academic or professional writing is cautious given that so many clinicians choose to conduct their private practices in so many ways. It is more likely, as far as estimates, that more than just a "rare" number of clinicians prescribe or encourage clients to look for extra help.
"All" is just never an option because it must be proven before being used as a descriptor for whoever engages in a specific action. Moreover, "all" is an impossibility as far as its application as a behavioral descriptor. "All", in academic and professional writing, would only be applied to biological functions.
Therefore, when you say "a few" you are referring to a group that withstands from the norm, but who can still represent a good and significant sample of the clinician population. Therefore, it is arguable that as far as statistics go, that there are clinicians out there who do recommend additional, quality materials as a supplement for counseling. Since the materials have a market that i,s in many occasions, sponsored by someone in the field we could argue that, while the numbers are not "overwhelming", there is still a presence of support for these products within the community. Therefore, a few of these community members may very well be responsible for the creation of these products and, as a result, recommend them to their clients and their families.