Directions: Select the best revision for the underlined part in the given sentence.

He called the resulting system Thought Field Therapy and began training the therapists in using an algorithms and diagnosing the underlying problems before the treatment might begin.

began training the therapists in using an algorithms and diagnosing the underlying problems before the treatment might begin

began to train the therapists to use algorithms and diagnosing the underlying problems before the treatment would begin

began training the therapists in using algorithms and diagnosing underlying problems before the treatment could begin

began training the therapists in how to use algorithms and diagnose underlying problems before the treatment can begin