Petroleum is a non-renewable source of energy because it

Step 1: Analyze the question The question asks why petroleum is called a non-renewable source of energy. So we need the reason that explains "non-renewable."

Step 2: Explain the concept

• Renewable energy sources can be replenished naturally within a short time (human lifetime). Examples: solar, wind, hydro, biomass.
• Non-renewable energy sources exist in limited quantities and take millions of years to form. Once consumed, they cannot be replaced within a useful time. Examples: petroleum (crude oil), coal, natural gas.

Petroleum formed from the remains of tiny marine plants and animals buried under layers of sediment and subjected to heat and pressure over millions of years. We use it far faster than nature can make it.

Step 3: Evaluate each option

• A. is formed naturally: Many renewable sources (wind, sunlight) are also natural, so this doesn't explain "non-renewable." ❌
• B. is cheap: Cost has nothing to do with whether a resource is renewable. ❌
• C. can be recycled after use: Burning petroleum fuels converts them to CO₂ and water, and they cannot be recycled as fuel. Also, if something could be recycled, that would make it more renewable. ❌
• D. cannot be regenerated once used up: This is the definition of non-renewable. ✅

Step 4: Answer

Tip: In WASSCE/JAMB, when you see "non-renewable," think "limited supply, cannot be replaced once exhausted." Look for the option that mentions exhaustion or not being replaced, and ignore options about cost or natural origin.