The outer conductor diameter and the inner conductor diameter dimensions of a coaxial cable are made twice toits original value. (Coaxial line is filled with dielectric material having dielectric constant ¢,= 4.0 ). The correct statementis :

A

Impedance remain same toit's original value

B

Impedance_reducestohalf_ofit's-original value

C

Impedance increase & becomestwiceoforiginal value

D

None of above