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Three different circuits $(\ce{I, II}$ and $\ce{III})$ are constructed using identical batteries and resistors of $R$ and $2R$ ohm. What can be said about current $\ce{I}$ in arm $AB$ of each circuit.

• A
  $\mathrm{I}_{\mathrm{I}}>\mathrm{I}_{\mathrm{II}}>\mathrm{I}_{\mathrm{III}}$
• B
  $\mathrm{I}_{\mathrm{I}}<\mathrm{I}_{\mathrm{II}}<\mathrm{I}_{\mathrm{III}}$
• C
  $\mathrm{I}_{\mathrm{II}}<\mathrm{I}_{\mathrm{I}}<\mathrm{I}_{\mathrm{III}}$
• ✓
  $\mathrm{I}_{\mathrm{I}}=\mathrm{I}_{\mathrm{II}}=\mathrm{I}_{\mathrm{III}}$