问题如下：
Which of the below is most likely categorized as greenfield investment?
选项：
A.The lease agreement of existing toll roads.
B.The investment of hospital in development plan stage.
C.The privation of existing hospital.
解释：
B is correct.
按照被投资标的状态：可以将基建投资分为：在建(greenfield)或者已经建成(brownfield),两种，这个题目问的是哪个是在建状态的，所以只有B符合。
请问三个选项分别是什么意思呀
