Correct option is A
Option (a) is the correct order of the given sentences.
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A introduces the topic by defining psychotherapy.
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C explains the purpose of the psychotherapy relationship.
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B logically follows, describing the need for trust in therapy.
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D expands on what psychotherapies aim to achieve.
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E concludes by discussing the need for environmental changes in psychological adjustment.
Thus, the correct sequence is
A → C → B → D → E.