Choose the best paraphrasing for each of the following sentences: The war acted merely as a catalytic agent in this breakdown of the Victorian social structure.
选项：

A:The war speeded up the collapse of the Victorian social structure.;
B:This breakdown of the Victotian social structure resulted in the war.;
C:The war was just an element in this breakdown of the Victorian social structure.;
D:This breakdown of the Victorian social strucuture actually stopped the war.