In an R-L-C series circuit, at resonance frequency, the voltage across the resistance is:

Correct option is B

​$$\text{At series resonance frequency, the inductive reactance } (X_L) \text{ is equal to the capacitive reactance } (X_C): \\[6pt]X_L = X_C \\[12pt]\text{The impedance in an R-L-C series circuit is:} \\[6pt]Z = \sqrt{R^2 + (X_L - X_C)^2} \\[12pt]\text{At resonance:} \\[6pt]\bullet \, X_L - X_C = 0, \text{ so:} \\[6pt]Z = R \\[12pt]\text{The circuit's impedance becomes purely resistive, and the total applied voltage appears across the resistance.}$$​​