Step 1: Aim.
Find the practitioner linked with the use of folk forms in modern Indian stage work.
Step 2: Main fact.
Habib Tanvir set up Naya Theatre and trained village artists from Chhattisgarh. He built full length productions around their songs, dance and acting style. His 'Charandas Chor' is the standard example of this approach.
Step 3: Go through the names.
E. Alkazi: urban, text based and training focused, not folk.
Satyadev Dubey: experimental and playwright focused, not folk.
Pravin Joshi: Gujarati urban commercial and experimental work, not folk.
Habib Tanvir: folk artists plus modern plays, which matches the question.
Step 4: Outcome.
The match is Habib Tanvir, the fourth name in the list.
Always read the options slowly and match each name with a clear fact you know about it. Names that sound close can belong to very different traditions, so do not guess from the sound of a name alone. Writing the key fact next to each name, as done above, makes the elimination quick and safe. This habit also helps in similar questions on theatre personalities, plays and groups.
Final Answer:
The correct name is Habib Tanvir, so the answer is option 4.
\[ \boxed{\text{Option 4}} \]