Non-renewable energy depletes finite resources

Steps:

• Define renewable energy as sources that replenish naturally and are inexhaustible on human timescales.
• Evaluate each option: solar cells harness sunlight, which is endless; hydroelectric uses flowing water cycles; wind turbines capture atmospheric winds; nuclear reactors rely on uranium fission.
• Identify the finite resource: uranium is mined and limited, unlike natural cycles.
• Conclude the non-renewable source based on resource depletion.

Why D is correct:

• Nuclear reactors use uranium fuel, a finite non-renewable resource per the definition of renewability in energy sustainability laws.

Why the others are wrong:

• A: Solar cells convert abundant, replenishing sunlight into electricity.
• B: Hydroelectric generators harness the renewable water cycle driven by evaporation and precipitation.
• C: Wind turbines utilize ongoing atmospheric wind patterns, which are naturally sustained.

Final answer: D