Why Did the Chinese Conversion from Ming to Qing Rule

Why did the Chinese conversion from Ming to Qing rule go smoothly?

A) The Ming had already adopted a bit of Qing culture.
B) The Ming felt some kindred to the Qing, since both groups had been vandalized by the Mongols.
C) The Qing left many Ming officials completely in charge locally.
D) The Qing made it clear that only those who cooperated fully would be allowed to continue their trade practices.
E) The Qing realized the sophistication of the Ming and were already copying them in some ways before their conquest.