Answer:
D. Urban cities
Explanation:
According to researchers, the metropolitan cities are the most significant contributors of heat in the islands, through which the evaporation occurs when concrete replaces plants. Due to the lack of proper evaporation, it retains the energy, thus keeping the urban areas warmer.
Further, most people living in urban centers have machinery in their buildings that generate heat; for instance, the air conditioner raises temperatures with over 1 degree Celsius. Thus the heat is stored more in the day than plants, and during the night the heat is emitted leading to warm temperatures .
