Which of the Following Best Describes the Geology of the Pacific

Which of the following best describes the geology of the Pacific coastal regions of western North America including Alaska?

A) An earlier, continental margin broke apart and the geologically similar fragments were tectonically reassembled.
B) Geologically different, microcontinent- sized fragments and terranes, formed elsewhere, were tectonically accreted to North America.
C) Tightly folded, continental shelf strata were squeezed between North America and the convergent, Bering- Siberian subcontinent.
D) A massive subcontinent of old igneous and metamorphic rocks (similar to India) was accreted during late Proterozoic time.