Which of the following is one of the five Niyamas?

Saucha is one of the five Niyamas in the context of yoga philosophy. The Niyamas are ethical guidelines and personal observances that support an individual's personal growth and well-being on their yoga journey. Saucha specifically refers to purity and cleanliness, encompassing both physical cleanliness and purity of mind. This principle encourages practitioners to maintain cleanliness in their bodies, environments, and thoughts, fostering a clear and focused state conducive to spiritual practice.

In contrast, Asana refers to the physical postures practiced in yoga, which is categorized under the eight limbs of yoga but does not belong to the Niyamas. Bhakti signifies devotion and love towards the divine, often considered a path in itself but not one of the Niyamas. Dhyana, which means meditation, is also part of the eight limbs of yoga, focusing on the practice of deep meditation rather than personal observances. Therefore, Saucha stands out as the correct choice among the options provided, aligning perfectly as one of the five Niyamas.