Final answer:
The knowledgeable spectator who watches a classical Indian dance and enhances the abilities and energy of the performers is called the Sabha Monitor.
Step-by-step explanation:
The knowledgeable spectator who watches a classical Indian dance and has the responsibility to be engaged in the performance because it enhances the abilities and energy of the performers is called the Sabha Monitor. The Sabha Monitor is an integral part of the audience and is expected to be knowledgeable about the dance form and actively participate in the performance by applauding, encouraging, and appreciating the dancers. Their engagement helps create a vibrant and energetic atmosphere that motivates the performers to give their best.