The correct option is B 10 J
According to 10 percent law, only 10 percent of the energy is transferred to each trophic level from the lower trophic level. During the flow of energy from the Sun, only 1% of energy is trapped by the producers during their photosynthetic activity and gets converted into food energy. In this case, the plants trap only 10 J (1% of 1000 J) of energy from the Sun.