it was said ( )was how the fire broke out.

题目

it was said ( )was how the fire broke out.
It was said ________ was how the fire broke out.
A:that that
B:that what
C:that
D:what
第一个that是引导主语从句,那第二个that到底是什么意思呢,实在想不通,（随便帮我翻译下这句话的意思）

答案