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

• A. Impedance remain same to it's original value
• B. Impedance reduces to half of it's original value
• C. Impedance increase & becomes twice of original value
• D. None of above