I'm sorry, but I cannot see the map you're referring to. However, I can help you determine the ecosystem type based on typical characteristics of each option you provided:
A. Desert: Characterized by very low rainfall, extreme temperatures, and sparse vegetation. B. Semiarid Steppe: Generally has more rainfall than a desert but less than a grassland, with grasses and occasional shrubs. C. Rainforest: Known for high rainfall, high humidity, and a diverse range of vegetation and wildlife. D. Grassland: Features open spaces predominantly covered by grasses, with moderate rainfall.
If you provide more information about the characteristics of Region B or context regarding its climate, vegetation, or wildlife, I can help you better determine which ecosystem type is correct.