Final answer:
Sivananda Yoga is characterized as a gentle and meditative form of yoga, focusing on traditional asanas, pranayama, and spiritual elements like mantras. So the correct option is A.
Step-by-step explanation:
The correct answer to the question of which statement is true of Sivananda Yoga is A. It is a gentle and meditative form of yoga. Sivananda Yoga is a traditional form of yoga that focuses on a gentle and meditative practice. It includes not only the physical postures, known as asanas, but also breath control (pranayama), and is often enriched with mantras and aspects of spirituality, adhering to the five principles of proper exercise, breathing, relaxation, diet, and positive thinking and meditation. While mantras may often be a part of the broader practice, the distinguishing feature of Sivananda Yoga is its gentle and meditative nature rather than the length of time poses are held, making option B an additional element but not a defining feature, and option C incorrect.