Step 1: Plan:
I will think about which term describes the time frame that every kind of performance must follow, and test each option against that.
Step 2: Think about a performance:
A singer needs to stay in time, a sitar player needs to stay in time and a dancer needs to land on the sam. The thing that keeps them all together is the taal.
Step 3: Test the parts of a taal:
Vibhag, avriti and bol are all pieces or parts that live inside a taal. A part cannot be the base of the whole.
Step 4: Pick the whole:
Taal is the whole system. It holds the vibhag, the avriti and the bols together.
Step 5: Conclusion:
The base for vocal, instrumental and dance art is Taal, which is option 2.
Final Answer:
The correct answer is Taal, option 2.
\[ \boxed{2} \]