What did the rio grande river create?

 In Mexico, however, the river is called Rio Bravo del Norte, meaning "wild river of the north." A river whose waters are vital to its dry basin, the Rio Grande rises in the San Juan Mountains of southwestern Colorado and flows for 1,885 miles (3,035 kilometers) to the Gulf of Mexico.PLEASE ME

Ymultiplies by 7 for everytime x increases by 1

Ithink the answer is d but don’t answer it. i need points.