Concept:Hydro-electric power (HEP) relies mainly on water supply, dam sites, and electricity demand, not on very high mountain relief.
Explanation:A regular supply of water is essential because turbines need a steady flow to generate electricity consistently.
Suitable sites for dams are critical because HEP requires a valley or reservoir where water can be stored and released under control.
A rapid increase in demand for electricity encourages the government to expand HEP projects to meet the growing needs of homes and industries.
The presence of high mountains is not a major requirement in Nigeria, as HEP is often generated from rivers and artificially created reservoirs on lowlands, such as Kainji and Shiroro dams.
Therefore, among the options, the factor that least affects HEP development in Nigeria is the presence of high mountains.
Answer:D. presence of high mountains