What is the name of the continental rift zone in the state of Chihuahua characterised by a flat valley floor surrounded by steep mountain walls, formed by extensional tectonics rather than river erosion?

• A Bolson de Mapimi ✓
• B Valle de Bravo
• C Valle de Guadalupe
• D Valle de Santiago

The Bolson de Mapimi is a closed desert basin in the Chihuahuan Desert, part of the Basin and Range geological province that stretches across the border into Texas.