The natural frequency of an $I-C$ circuit is $1,25,000$ cycle/s. Then the capacitor C is replaced by another capacitor with a dielectric medium of dielectric constant by $25 \;kHz$. The value of K is

Question

$$\begin {array} {1 1} (a)\;3.0 & \quad (b)\;2.1 \\ (c)\;1.56 & \quad (d)\;1.7 \end {array}$$