The vector that must be added to the vector $\hat i - 3\hat j + 2\hat k$ and $3\hat i + 6\hat j - 7\hat k$ so that the resultant vector is a unit vector along the $y-$axis is

  • A

    $4\hat i + 2\hat j + 5\hat k$

  • B

    $ - 4\hat i - 2\hat j + 5\hat k$

  • C

    $3\hat i + 4\hat j + 5\hat k$

  • D

    Null vector

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