Though the price of the camera is OK,I don't think I'll take

Though the price of the camera is OK,I don't think I'll take it.Though the price of the camera is OK,____I don't think I'll take it.A.but B.and C.yetD.so 你们说是用C,可答案上是B,B不可以吗,C可以放在句首吗?