In ecological systems, energy transfer between trophic levels is typically described by the 10% rule, which suggests that only about 10% of the energy from one trophic level is passed on to the next level.
If producers generate 100% of the energy, by the time it reaches tertiary consumers, approximately 0.1% of that energy remains. This is because energy is lost at each trophic level due to factors such as respiration, heat, and waste.
So, the correct response is 0.1%.