It is because of her lack of experience ________ she does not

It is because of her lack of experience ________ she does not know how to deal with the situation.
A、which
B、so
C、so that
D、that
【正确答案】：D
【题目解析】：强调句的结构为It is+成分+that分句，It is后面只有接的人时后面可以用who引导分句，此外均用that引导。