What was an effect of the spread of buddhism in the northern chinese "barbarian" courts?

The spread of Buddhism in the northern Chinese "barbarian" courts provided legitimacy by espousing another option for philosophy that could counter criticisms of the Han Chinese who favored classical learning. A big part of north China was dominated by the Xianbei tribe. Buddhist monks became advisers to the rulers of these barbarian tribes. Buddhist monks also got a big support from the rulers of various barbarian states. 

Explanation:

I think A

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