$A$ force $F\,\hat{k}$ acts at the origin $O$ of a coordinate system. What is the torque about the point $(1, -1, 0)$?

  • A
    $F\,(\hat{i} - \hat{j})$
  • B
    $-F\,(\hat{i} + \hat{j})$
  • C
    $F\,(\hat{i} + \hat{j})$
  • D
    $-F\,(\hat{i} - \hat{j})$

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