Question

what is a characteristic of the mountain region of california? in the western part of the state, next to the pacific ocean one of the smallest regions in the state a very large region, covering almost half the state part of the sonoran desert, which includes areas in california, arizona, and mexico

Explanation:

The mountain - region in California is a large area. It is not on the western part next to the Pacific Ocean (that's the coastal region), not one of the smallest regions, and not part of the Sonoran Desert. It covers a significant portion of the state.

Answer:

a very large region, covering almost half the state