At $$25^\circ$$C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is $$9.54 ohm^{-1} cm^{2} mol^{-1}$$ and at infinite dilution its molar conductance is 238 $$ohm^{-1} cm^{2} mol^{-1}$$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is:

A

40.800 %

B

2.080%

C

20.800%

D

4.008 %