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Which of these best explains why very little usable energy remains beyond the fourth trophic level?

Question
Which of these best explains why very little usable energy remains beyond the fourth trophic level?
Because organisms at higher levels do not need energy
Because of the successive loss of about 90% of energy at each trophic level transfer
Because higher-level organisms produce their own energy
Because decomposers absorb all remaining energy immediately
Answer
Because of the successive loss of about 90% of energy at each trophic level transfer
Detailed Explanation
With roughly 90% of energy lost at each transfer (only about 10% passed on), very little usable energy is left after several trophic levels. — Examisthan.com
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