Constant Availability of Energy Sources

Steps:

• Identify the requirement: an energy source accessible 24/7 without interruption.
• Evaluate each option based on natural availability and reliability.
• Consider environmental factors like time, weather, and cycles that affect renewables.
• Select the source that operates independently of these variables.

Why A is correct:

• Natural gas is a fossil fuel stored underground and extractable on demand, providing continuous supply via pipelines without reliance on external cycles.

Why the others are wrong:

• B. Solar cells generate power only during daylight hours, unavailable at night.
• C. Tidal energy depends on gravitational pull of the moon and sun, varying with tidal cycles.
• D. Wind energy fluctuates with weather patterns and wind speeds, not constant.

Final answer: A