In Bharatanatyam, the four key components are Bhava (expression), Raga (music), Tala (rhythm), and Natyam (dance). 'Bha' specifically stands for Bhava, which refers to emotional expression and acting in the dance. The other components are Ra (Raga) and Ta (Tala), not Bharatha. Option C is incorrect because Bharatha is not one of the individual components.