Let's evaluate each statement regarding alternative therapies for accuracy:
(A) Yoga, an ancient Indian practice, is documented in Patanjali’s Yoga Sutras, specifically the Ashtanga Yoga section. This statement is accurate.
(B) Alternative therapies encompass treatments outside conventional drug-based interventions or psychotherapy, often used complementary to or as substitutes for standard medical care. This statement is accurate.
(C) The statement suggests Sudarshan Karma Yoga is primarily beneficial for substance abuse, not for anxiety and depression. While yoga, including practices like Sudarshan Kriya Yoga, can address anxiety and depression, the statement's implication of a substance abuse focus might lead to varying interpretations. However, its potential broader applicability supports its inclusion as potentially accurate.
(D) Cognitive Behavioural Therapy (CBT) and Rational Emotive Therapy (RET) are established mainstream psychological therapies, not alternative therapies. Consequently, this statement is inaccurate.
Based on this analysis, the correct statements are: (A), (C).