What river has the Yellowstone, Platte, and Kansas rivers as tributaries?

Here is the question :

WHAT RIVER HAS THE YELLOWSTONE, PLATTE, AND KANSAS RIVERS AS TRIBUTARIES?

Here is the option for the question :

• Colorado River
• Missouri River
• Ohio River
• Snake River

The Answer:

And, the answer for the the question is :

Explanation:

[STC0017327]. The Cheyenne, Osage, and Niobrara rivers are some of the Missouri River’s other significant tributaries. About 10 miles north of St. Louis, the Missouri joins the Mississippi River, leading some geographers to classify it as a tributary of the Mississippi.