Final answer:
The Sanskrit term for the Ashtanga Primary series is 'Yoga Chikitsa', which focuses on aligning the body and detoxifying the system as part of the Ashtanga Yoga practice.
Step-by-step explanation:
The Sanskrit term for the Ashtanga Primary series is C) Yoga Chikitsa. It translates to 'Yoga Therapy' and is the first series in the Ashtanga Yoga system established by Sri K. Pattabhi Jois. This series is focused on aligning the body, building strength, and detoxifying the system. It differs from the other options listed as follows: A) Vinyasa refers to a method of yoga in which movements form a flowing sequence in coordination with breath; B) Surya Namaskara, or Sun Salutations, are a series of poses often performed at the beginning of a Vinyasa or Ashtanga practice; D) Pranayama is the practice of breath control in yoga.