The incorrect option in reference to the statement is :

(4) Buddhism placed emphasis on 'varna' order in the society.

Buddhism did not emphasize the 'varna' order in society. In fact, Buddhism challenged the traditional caste system and the concept of birth-based social hierarchy. It taught the importance of conduct, morality, and the potential for spiritual growth in all individuals, regardless of their social or caste background. Buddhism was known for its more egalitarian and inclusive approach, which appealed to many people dissatisfied with existing religious practices and the rigid social structures of its time.

So,the correct option is [4].