Concept:
In Indian dramaturgy, Vritti refers to the mode of dramatic production or the style of performance. The Natyashastra mentions four Vrittis: Bharati (verbal), Satvati (psychological/grand), Kaishiki (graceful), and Arabhati (energetic).
Step 1: Evaluating the Assertion (A).
The assertion states that Vritti is the mother of drama. This is a traditional view in Indian aesthetics because the physical, verbal, and mental activities of the characters constitute the very essence of the performance.
Step 2: Evaluating the Reason (R).
The reason explains that Vritti is a fixed stylistic framework that dominates the production. Since the choice of Vritti determines the overall "flavor" and execution of the play, it logically supports why it is considered the foundational "mother" of the drama.