From whom did K. G. Subramanyan learn the technique of sand casting for creating large-scale relief sculptures?

Local Rajasthani artists

The correct answer is option 2: Local Rajasthani artists

K. G. Subramanyan was attracted to the technique of sand casting, which was known to local Rajasthani artists.

K. G. Subramanyan, Gulam Mohammed Sheikh teacher and a founding member of the Baroda Art School, had studied in Shantiniketan. He had learned about the public role of art from his teachers, Benode Behari Mukherjee and Ramkinker Baij. He was interested in mural art or art on large public buildings, which can be seen by everyone. He was attracted to the technique of sand casting, which was known to local Rajasthani artists. From them, he learned how to create large-scale relief sculptures by repeating the basic unit of shape.