Who among the following was primarily an exponent of Bharatanatyam dance?

The correct answer is Rukmini Devi Arundale.

Explanation:
Rukmini Devi Arundale was a celebrated Indian classical dancer, choreographer, and exponent of Bharatanatyam. She played a crucial role in reviving and transforming Bharatanatyam from a traditional temple dance into a globally recognized classical art form. She also founded the renowned Kalakshetra Foundation in Chennai in 1936 to preserve and impart training in Bharatanatyam and traditional arts.

Overview of Other Exponents:
1. Kelucharan Mohapatra: He was a legendary master and exponent of Odissi dance, playing a central role in its 20th-century revival.
2. Pandit Birju Maharaj: He was a world-renowned maestro of Kathak dance from the Kalka-Bindadin gharana of Lucknow.
3. Guru Bipin Singh: He was a key pioneer, choreographer, and guru of Manipuri dance.