[求助]

auroratian

请教大家一个逻辑的问题。

Many geologists theorize that the trial of volcanic craters and cinder cones along the Snake River plain of sourthern Idaho was produced as the North American continent slid westward over a stationary "plume", a vertical channel through which molten rock rose intermittently from the earth's core to burst through its crust.

Which of the following, if true, tends to support the geologists' theory of how the trail was produced?

A. The largest craters and cinder cones are on the eastern margin of the trail.

B. The most  violent volcanic activity appprently occured at the western margin of the trail.

C.The craters and the cinder cones are evenly spaced throughout the extent of the trail.

D.The newest craters and cinder cones are on the eastern margin of the trail.

E. The caters and cinder cones on the western margin of the trail generally took longer to form than did those on the eatern margin.

 

请教高手解答一下，答案是D，和A 有什么本质上的区别呢？

在线等回答。谢谢。