7. A series RLC circuit, driven with a sinusoidal external emf with rms voltage 120 V, contains a resistance R = 200 Ω, an inductance L =1.0 H , and a capacitance C = 16 μF. What is the resonance frequency of this circuit?
(A) 960 Hz
(B) 1,600 Hz
(C) 40 Hz
(D) 6,400 Hz
(E) 250 Hz