问题如下图：第三个为什么错？？？
选项：
A. 
B. 
C. 
解释：
They usually have active seconry markets. They are less customizethpublicly offerebon. A is correct. Private placements are typically non-unrwritten, unregisterebonofferings thare solonly to a single investor or a small group of investors. 请问A里的non-unrwritten怎么理解？不能承销，只能包销吗？
They usually have active seconry markets. They are less customizethpublicly offerebon. A is correct. Private placements are typically non-unrwritten, unregisterebonofferings thare solonly to a single investor or a small group of investors. B不知道错在哪里？active?
