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Two cells of emf E(1) and E(2) are to ...

Two cells of emf `E_(1) ` and `E_(2)` are to be compared in a potentiometer `(E_(1) gt E_(2))` . When the cells are used in series correctly , the balancing length obtained is 400 cm. When they are used in series but `E_(2)` is connected with reverse polarities, the balancing obtaiend is 200cm. Ratio of emf of cells is

A

`3:2`

B

`3:1`

C

`4:1`

D

`4:3`

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