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Two cells each of emf e but internal res...

Two cells each of emf e but internal resistances `r_1` and `r_2` are connected in series through an external resistance R. IF the potential difference across the first cell is zero while current flows,the relation of R in terms of `r_1` and `r_2` is

A

`R=r_1+r_2`

B

`R=r_1-r_2`

C

`R=1/2(r_1+r_2)`

D

`R=1/2(r_1-r_2)`

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