What is the prominent circular feature in the Central Valley that has a volcanic origin?

The prominent circular feature in the Central Valley with volcanic origins is Sutter Buttes. This unique geological formation is often considered the world's smallest mountain range, rising sharply from the surrounding plains of the Central Valley. The Sutter Buttes are composed primarily of volcanic rock, making them an important site for studying volcanic activity and geology in California.

The structure of Sutter Buttes is a remnant of an ancient volcanic eruption, and its circular shape is characteristic of volcanic activity that has shaped the landscape. The surrounding sedimentary deposits further emphasize its distinct appearance and add to the geological interest of the area.

In contrast, Mount Shasta and Lassen Peak are significant volcanic features located further north in California, not in the Central Valley. Clear Lake Volcano is another important volcanic area, but it is situated north of the Central Valley as well. Therefore, Sutter Buttes stands out as the correct answer because it is directly situated within the Central Valley and exemplifies a volcanic feature that has shaped its landscape.