How did the fall of the Han dynasty encourage the introduction of new, non-Chinese religions into China?

AWith the revocation of the Mandate of Heaven, there was no institution to stop the spread of alien religions
BThe last Han emperor had been interested in religions of salvation and so introduced the ideas to the bureaucrats and it filtered down to Chinese citizens
CThe Confucian tradition lost credibility after the fall of the Han, and the era of warlords and nomadic invaders promoted the spread of foreign religions into China
DThe Han dynasty had actively sought to eradicate Buddhist monasteries from China, and with its demise the Buddhists saw an open door into China's elite society

One of the ways in which the fall of the Han dynasty encouraged the introduction of new, non-Chinese religions into China was that "c. The Confucian tradition lost credibility after the fall of the Han, and the era of warlords and nomadic invaders promoted the spread of foreign religions into China," since this led to wide-spread disorganization.

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