Which statement is an example of "philosophic doubt"?

Which statement is an example of "philosophic doubt"?
A .  Attention is the most powerful reinforcer for most clients so it will probably work with Freddie.
B .  I have many reservations about using the principles of behavior in designing treatment programs.
C .  I really do not think that food functions as a reinforcer for Linda since she often misses meals.
D .  Past research has shown that verbal behavior training is effective but this could change when new research is conducted.

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Answer: D