Three charges $+2q$, $+3q$, and $-4q$ are situated at $(0, -3a)$, $(2a, 0)$, and $(-2a, 0)$ respectively in the $xy$ plane. The resultant dipole moment about the origin is . . . . . .

  • A
    $2qa(3\hat{j}-\hat{i})$
  • B
    $2qa(3\hat{i}-7\hat{j})$
  • C
    $2qa(7\hat{i}-3\hat{j})$
  • D
    $2qa(3\hat{j}-7\hat{i})$

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