Concept:Exhaustible energy sources are those that exist in limited quantities and cannot be quickly replaced.Explanation:Solar energy is continuously available from the sun, so it is not exhaustible. Tidal power is steadily produced by gravitational forces, so it is also not exhaustible. Fossil fuels like coal, oil, and natural gas take millions of years to form and can be used up. Therefore, among the listed sources, only fossil fuels are exhaustible.Answer:D. ii only