3 下圖理想運算放大器電路中，若輸入 vI1 = 4 + 0.125 sinωt (V)、vI2 = -4 (V)時輸出 vO = -0.5 sinωt (V)，則下列敘述何者正確？
(A)R1 = 10 kΩ，R2 = 10 kΩ
(B) R1 = 15 kΩ，R2 = 10 kΩ
(C)R1 = 20 kΩ，R2 = 15 kΩ
(D)R1 = 25 kΩ，R2 = 25 kΩ