关于floods和flooding的区分问题~~

67.   (28133-!-item-!-188;#058&003500)

Scientists say that each of the photographs taken of the Ares Vallis plain by the Mars Pathfinder indicate the overwhelming extent to flooding on the planet billions of years ago and the degree that rocks were scattered by its force.

(A) indicate the overwhelming extent to flooding on the planet billions of years ago and the degree that

(B) indicate that the extent of the floods on the planet billions of years ago was overwhelming and the degree to which

(C) indicate the overwhelming extent of the floods on the planet billions of years ago and the degree to which

(D) indicates the overwhelming extent of the flooding on the planet billions of years ago and the degree to which

(E) indicates the overwhelming extent to flooding on the planet billions of years ago and the degree that

请问NN们~~这里flooding和floods有什么实质性的区别吗？

自己顶一下~~~

动名词强调动作本身，对应的名词强调动作的结果。

不过在这里不是一个很好的判断依据，直接主谓一致就排除了A B C。

extend to