A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance R, connected across the given cell, has values of 
(i) infinity              (ii) 9.5 $\Omega$  the balancing lengths on the potentiometer wire are found to be 3 m and 2.85 m, respectively. The value of internal resistance of the cell is 
 

• A

  0.25 $\Omega$

• B

  0.95 $\Omega$

• C

  0.5 $\Omega$

• D

  0.75 $\Omega$