The correct answer is: A. Law of conservation of current
The law of conservation of current is not a valid conservation law of classical physics because it is not consistent with the laws of electromagnetism. The laws of electromagnetism state that electric charge can be created and destroyed, which contradicts the law of conservation of current, which states that electric charge is conserved.
The law of conservation of energy states that energy can neither be created nor destroyed, only transferred from one form to another. The law of conservation of angular momentum states that angular momentum is conserved, meaning that the total angular momentum of a system remains constant unless an external torque is applied. The law of conservation of charge states that charge is conserved, meaning that the total charge of a system remains constant unless charge is added or removed from the system.
The law of conservation of current is a consequence of the law of conservation of charge. If charge is conserved, then the current, which is the rate of flow of charge, must also be conserved. However, the laws of electromagnetism state that electric charge can be created and destroyed, which contradicts the law of conservation of charge. Therefore, the law of conservation of current is not a valid conservation law of classical physics.