Step 1: Understanding the Concept:
The question refers to the origin of the "Rasa Theory," which is the central concept in Indian aesthetics concerning the emotional essence of a work of art.
Step 2: Detailed Explanation:
The Rasa Theory was first formally propounded by Bharata Muni in the Natyashastra.
He introduced the celebrated "Rasa Sutra," which states that Rasa is produced from the combination of Vibhava (determinants), Anubhava (consequents), and Vyabhichari Bhava (transitory states).
While Abhinavagupta (Option C) is famous for his 10th-century commentary Abhinavabharati and the addition of the ninth Rasa (Shanta Rasa), the primary development and foundation belong to Bharata Muni.
Kalidasa was a poet/playwright, and Panini was a Sanskrit grammarian.
Step 3: Final Answer:
The Rasa Theory was primarily developed by Bharata Muni.