An LCR circuit has $L= 3.0 H, C= 27 \;\mu F$ and $ R= 7.4 \;\Omega$ with a certain a factor. To improve the sharpness of resonance by reducing its full width at half maximum by a factor of 2, with out changing $w_0$, we can

Question

$(a)\;\text{ Double the value of R} \\(b)\; \text{Double the value of C} \\ (c)\; \text{reduce the value of R to R/2} \\ (d)\;\text{Charge the value of C to C/2} $