A parallel plate capacitor having plates of area S and plate separation d, has capacitance C1 in air. When two dielectrics of different relative permittivities (∈1 = 2 and ∈2 = 4) are introduced between the two plates as shown in the figure, the capacitance becomes C2 . The ratio \(\frac{C_2}{C_1}\) is
(A) 6/5
(B) 5/3
(C) 7/5
(D) 7/3
