Answer:
A. the Cimarron River
Step-by-step explanation:
In Spanish "cimarrón" means wild, specially if it was previously domesticated but scaped to the wilderness. By being an spanish word, we can asume the Spanish named it. Although various explorers named this river in different ways, one of them was from Spain. His name was Francisco Vázquez de Coronado in 1541; he was trying to discover the legendary gold-rich Seven Cities of Cibola.
The other location that could derive from spanish words is the Verdigris River, from verde=green and gris=grey, but it comes from French vert=green and gris=grey.