The correct option is B 10 Kg
Every energy transfer is governed by the second law of thermodynamics which states that whenever energy is transformed, there is a loss of energy through the release of heat. This exact same thing is going to happen when energy is transferred between trophic levels like in a food chain/web. According to ten percent law by lindemann, only 10 per cent of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level. On applying the 10% law
From grass the energy is tranferred to the deer then according to the law only 10 percent of one ton (1 ton = 1000 Kg), that is, 100 Kg biomass will be strored by the deer.
On successive transfer of stored biomass from deer to tiger 10 % of 100 Kg, that is, only 10 Kg of biomass will be stored by the tiger on consuming the deer.