Answer: (A) Peninsula
Step-by-step explanation:
The Baja region is one of the peninsula in the northwestern Mexico and it mainly separate the gulf of the Baja California from the pacific ocean. The Baja California region is basically located in Mexico which is bounded by the north united state.
The peninsula is basically separated from the Mexico of the mainland by the Colorado river and the gulf of the California. The central coast desert is one of the main desert on peninsula area.
Therefore, Option (A) is correct.