Step 1: Recall Tagore's own school.
Think of Shantiniketan itself as the evidence: open-air classes, gardens, and seasonal festivals built into the timetable.
Step 2: Connect the setting to the philosophy.
Tagore believed a child's senses and creativity grow through free contact with nature, not through walls and bells, so his ideal setting follows directly from that belief.
Step 3: Eliminate mismatched settings.
Strict classroom discipline, city settings, and digital tools all work against the freedom and nature-contact Tagore wanted for children.
Final Answer:
The natural environment is the one that matches both his school and his writings.