A load resistance R_L is supplied from a dc voltage source of resistance R. Maximum power transfer to the load occurs when which of the following condition is satisfied?

Correct option is D

​$$\text{For a DC circuit, the Maximum Power Transfer Theorem states that:} \\[8pt]\text{Maximum power is transferred from the source to the load when the load resistance is equal to the internal resistance of the source.} \\[12pt]\text{Thus,} \\[8pt]R_L = R$$​​