For a cell, a graph is plotted between the potential difference V across the terminals of the cell and the current I drawn the cell. The emf and the internal resistance of the cell are E and r, respectively. Then
A. `2V, 0.5 Omega`
B. `2V, 0.4 Omega`
C. `gt 2V, 0.5 Omega`
D. `gt 2V, 0.4 Omega`