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When the rms voltages $\;V_{L}\;,V_{C}\;$ and $\;V_{R}\;$ are measured respectively across the inductor L , the capacitor C and the resistor R in a series LCR circuit connected to an AC source ,it is found that the ratio $\;V_{L} : V_{C} : V_{R} = 1 : 2: 3\;$ . If the rms voltage of the AC source is 100 V , then $\;V_{R}\;$ is close to :

$(a)\;50\;V \qquad(b)\;70\;V\qquad(c)\;90\;V\qquad(d)\;100\;V$

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