What were the reasons Buddhism in China was viewed as a threat between the fourth and ninth centuries CE

Because other religions were losing "fame"

Explanation:

yes they have. but is this a true false question? if it is, the answer is true.

answer: born in saint-dié, in the vosges department, france, he studied law, and was called to the bar at paris in 1854,[2] but soon went into politics, contributing to various newspapers, particularly to le temps. he attacked the second french empire with great violence, directing his opposition especially against baron haussmann, prefect of the seine department. a series of his articles in le temps was later republished as the fantastic tales of haussmannlaxupa (1868).[2]

explanation: