The mangrove swamp in Nigeria is restricted to the

Explanation

The correct answer is D - Tropical rain forest.

Mangrove swamps are coastal ecosystems found in tropical and subtropical regions, including Nigeria. They thrive in areas with high rainfall, high temperatures, and saline or brackish water. In Nigeria, mangrove swamps are typically found along the coastal areas of the Niger Delta, which falls within the tropical rainforest region.

The other options are not accurate:

A. Sahel savanna: This region is too dry and far from the coast to support mangrove swamps.

B. Sudan savanna: While this region has some rainfall, it's still too dry and not suitable for mangrove swamps.

C. Guinea savanna: This region has more rainfall than the Sahel or Sudan savannas, but it's still not the primary location for mangrove swamps in Nigeria.