Final answer:
The Columbia Plateau is the correct example of a volcano or volcanic area built up of flood basalt, contrasting with the other options which are formed by different volcanic processes such as hot spots and subduction zones.
Step-by-step explanation:
Flood basalts are extensive regions covered by large volumes of basaltic lava. These areas are not always related with a single eruptive event but rather result from numerous eruptions over time, producing thick stacks of basalt layers. The Columbia Plateau in the Pacific Northwest of the United States is an example of such a region, known for its extensive flood basalt formations.
Volcanoes and volcanic areas can be built up through different processes. The Island of Hawaii, for example, is an active volcanic region created by a mantle hot spot, where lava flows create the volcanic mountains. Paricutin and Mt. Saint Helens are examples of volcanoes created from subduction zone activity. On the other hand, the Columbia Plateau represents a large area of flood basalt formation, which is distinct from the mostly singular volcanic mountains or islands formed by hot spots or subduction zones.