A potentiometer wire of length 10 m and resistance `10 Omega` per meter is connected in serice with a resistance box and a 2 volt battery. If a potential difference of 100 mV is balanced across the whole length of potentiometer wire, then then the resistance introduce introduced in the resistance box will be
A. `1900 Omega`
B. `900 Omega`
C. `190 Omega`
D. `90 Omega`
