Which major river runs through Oklahoma?

The Arkansas River is the correct answer as it is one of the major rivers that runs through Oklahoma, playing an important role in the state's geography, environment, and economic activities. It originates in the Rocky Mountains of Colorado and flows southeast through several states, including a significant stretch in Oklahoma, where it supports agriculture, recreation, and transportation. The river has historically facilitated trade and settlement in the region and continues to be vital for water supply and flood control.

In contrast, the Missouri River primarily runs through states to the north of Oklahoma, including Missouri and South Dakota, and does not traverse Oklahoma territory. The Rio Grande marks the boundary between the United States and Mexico and flows to the south of Oklahoma, also not entering the state. The Cimarron River is indeed a significant waterway in Oklahoma, but it is not as major or influential as the Arkansas River in terms of scale and impact on the state's development and ecosystem.