Answer: a. psychoanalytical therapy
Explanation:
Psychoanalytic therapy is a kind of therapy that has an objective to bring the unconscious or deeply buried thoughts, feeling into conscious mind that represses the emotions and experiences, since childhood which can brought under examination.
Here, in the given situation, Rena's experience of dieting can be taken into consideration. The rigid thoughts must be brought under examination to know the cause of failure of dieting.