My uncle,Sam,------ manager of the firm.

My uncle,Sam,______ manager of the firm.
A.is just made
B.has just been made
C.has just made
D.is just being made
答案是选择C 但是为什么?
我在看书上看的是 make是使役动词后面跟的可以省去TO 但是在被动语态里是不可以省去的 但是这里并没有出现 但是仍是选择C
说错了是选择B这里