Under what condition can the current passing through the resistance $R$ be increased by short-circuiting the battery of emf $E_2$? The internal resistances of the two batteries are $r_1$ and $r_2$ respectively.
- A$E_2r_1 > E_1 (R + r_2)$
- B$E_1r_2 > E_2 (R + r_1)$
- C$E_2r_2 > E_1 (R + r_2)$
- D$E_1r_1 > E_2 (R + r_1)$
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