Which of the following is correct for Watson and Crick's model of $DNA$. It is duplex with

  • A

    $10$ base pairs and $34\;\mathring A$ A distance for every turn.

  • B

    $10$ base pairs and $3.4 \;\mathring A$ distance for each turn of spiral.

  • C

    $20$ base pairs and $34 \;\mathring A$ for each turn.

  • D

    None of the above

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