The correct option is C R=15 Ω,L=3.5 H,C=30 μF
Quality factor of an L−C−R circuit is given by,
Q=1R√LC
So, checking each options one by one, we have
Q1=120√1.535×10−6=50×√370=10.35
Q2=125×√2.545×10−6=40×√590=9.43
Q3=115√3.530×10−6=10015√353=22.77
Q4=125×√1.545×10−6=40√30=7.30
Clearly Q3 is maximum out of Q1,Q2,Q3 and Q4.
Hence, option (c) should be selected for better tuning of an L−C−R circuit.