【单选题】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.
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.