$A$ : Geitonogamy helps in maintaining homozygosity and superiority of the race indefinitely.
$R$ : It is functionally, ecologically and genetically cross pollination.

• A

  Assertion and Reason both are correct and also correct explanation.

• B

  Assertion and Reason both are correct but not explanation of assertion.

• C

  Assertion is correct, but Reason is incorrect.

• D

  Both Assertion and Reason are incorrect.