With reference to the root nodules shown in the following diagram,select the correct option.

  • A
    Galls containing Anabaena
  • B
    Root nodules having Rhizobium phaseoli
  • C
    Root nodules having Rhizobium leguminosarum
  • D
    Galls containing Azospirillum

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Identify the $A$ to $D$ correctly in the given diagram of root nodule development and choose the correct option accordingly.

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