The magnitude of pairs of displacement vectors are given. Which pair of displacement  vectors cannot be added to give a resultant vector of magnitude $13\, cm$?

  • A

    $4 \,cm, 16 \,cm$

  • B

    $20 \,cm, 7 \,cm$

  • C

    $1 \,cm, 15 \,cm$

  • D

    $6 \,cm, 8 \,cm$

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