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78. A parallel plate capacitor with air between the plates has a capacitance of 9 pF. The separation between its plates is ā€˜dā€™. The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant $K_1=3$ and thickness $\frac{d}{3}$ while the other one has dielectric constant $K_2 = 6$ and thickness $\frac{2d}{3}$. Capacitance of the capacitor is now

( A ) 45 pF
( B ) 1.8 pF
( C ) 20.25 pF
( D ) 40.5 pF

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