Step 1: Match institution to founder: Kerala Kalamandalam goes with Vallathol. Darpana goes with Mrinalini Sarabhai. Visva-Bharati goes with Tagore.
Step 2: What is left: Kalakshetra is the one left. Its founder is Rukmini Devi Arundale, who started it in 1936 to teach Bharatanatyam in a traditional guru-shishya setting.
Step 3: Check: Rukmini Devi also worked to give the name Bharatanatyam to the old Sadir dance.