The emf and internal resistance of a cell are 2 V and \( 0.5 \Omega \) respectively. It is arranged with \( 1 \Omega \) , \( 2 \Omega \) , and \( 4 \Omega \) resistance in a parallel combination, Find the potential difference of the two ends of middle resistance.

A 4.07 V

B 3.07 V

C 2.07 V