The correct option is C Laws of thermodynamics
Energy flow in the living systems starts from the producers to primary and secondary and finally to the decomposers. Such energy flow and energy transformations in living systems strictly confirms the law of thermodynamics. The law of thermodynamics helps in understanding the energetics and direction of process. The law of thermodynamics states that the energy can neither be created nor destroyed i.e., energy may be transported from one region to another region. Living organisms exchange material and energy with its surroundings. In other words, such a process confirms the law of thermodynamics.