In which of the following Buddhist text, through a dialogue between a King and a disciple of Buddha, the Buddhist attitude towards varna is shown?

Majjhima Nikaya

The correct answer is Option 4 - Majjhima Nikaya

The story, based on a Buddhist text in Pali known as the Majjhima Nikaya, is part of a dialogue between a king named Avantiputta and a disciple of the Buddha named Kachchana. While it may not be literally true, it reveals Buddhist attitudes towards varna.