Step 1: Sort the forms:
Classical forms follow fixed rules: Krishnanattam and Gaudiya Nritya. Folk forms follow natural speech and action.
Step 2: Remove the classical ones:
Remove options 2 and 4 as they are Natyadharmi.
Step 3: Choose between the folk forms:
Therukoothu is very stylised in face paint, so Jatra is the more natural, Lokadharmi form.
Step 4: Decide:
The answer is the third printed choice. The question is a little open, so this is the best fit.
Step 5: Recheck the meaning:
Lokadharmi means acting that copies life as people live it. Jatra scenes use everyday speech and strong feeling, which agrees with that meaning.
Final Answer:
Option 3, Jatra, is correct. \[\boxed{3}\]