What artistic style did Jamini Roy adopt after rejecting academic training?

Flat and colorful folk painting

The correct answer is Option 4: Flat and colorful folk painting

After rejecting academic training, Jamini Roy adopted the flat and colorful style of folk painting.

Jamini Roy is a unique example of modern Indian artist, who after undergoing academic training in the colonial Art School rejected it only to adopt the flat and colourful style of folk painting seen in villages. He wanted his paintings to be simple and easy to duplicate to reach a wider public and based on themes like women and children, specifically, and rural life, generally.