The correct option is C T1
With reference to the given image, maximum energy is available at level T1. T1 is the first trophic level and has 100% of energy formed by photosynthesis. When this energy is being transferred to the next trophic level, about 80 - 90 percent of energy is lost as heat, i.e., only 10% of energy will be available to the next trophic level.