What Geologic Events Are Expressed in This Cross Section of the Western

What geologic events are expressed in this cross section of the western U.S. in late Paleozoic - early Mesozoic time?

A) an old episode of continental rifting that lead to a passive margin
B) collision of an island arc with western North America
C) oceanic crust and sediment that was thrust onto North America
D) a basin formed by the weight of thrust sheets
E) all of these

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