The correct answer is A) Red Bed Plains.
The region that is home to the Glass Mountains is the Red Bed Plains.
The Glass Mountains is a region in the Red Bed Plains in the state of Oklahoma, specifically in Northwestern Oklahoma. The mountains in the region got their name for the gypsum and selenite crystals that cover the surface of the mountains. These are no high mountains but rock formations of about 150 to 200 feet
The other options of the question were B) Gypsum Hills. C) Wichita Mountains. D) Sandstone Hills.