Energy Cannot Be Created or Destroyed

Steps:

• Recall the first law of thermodynamics: energy in a closed system remains constant.
• Evaluate each choice against this law.
• Eliminate options that imply energy creation, destruction, or efficiency limits.
• Select the statement matching the constant total energy.

Why C is correct:

• The first law of thermodynamics defines conservation of energy as the total energy in a closed system being constant, neither created nor destroyed.

Why the others are wrong:

• A misinterprets by suggesting energy creation limits, not conservation.
• B confuses conservation with resource scarcity, not the physical law.
• D describes energy efficiency or work output, not total energy constancy.

Final answer: C