Which of the following is considered a strength of the humanistic perspective?
it takes into account various factors that make up the "self."
professional judgment of the therapist is highly valued.
negative behaviors are typically corrected very quickly
. it focuses exclusively on behaviors or thoughts.

I would say every one of those except "negative behaviors are typically corrected very quickly" because the other ones feel more like strengths to me.
if I had to choose the best one I would have to say "it focuses exclusively on behaviors or thoughts", but it was very close between this one and "it takes into account various factors that make up the 'self'".