In case of AC circuit power loss in resistive circuit.

Explanation

In an AC circuit, power refers to the average rate of energy dissipation. In a purely resistive circuit, voltage and current are in-phase, meaning they reach their peak values simultaneously. This in-phase relationship ensures that the instantaneous power, calculated as P = VI, remains positive throughout the cycle. Resistors convert electrical energy into heat, a process that cannot result in negative power loss. Therefore, the power loss must be positive, making Option A correct. Options B and C are incorrect because they misinterpret the nature of power loss in resistive circuits. Option D is incorrect as it fails to provide any relevant information about power loss in such circuits.