The extremities of a diagonal of a parallelogram are the points $(3, – 4)$ and$(– 6, 5)$. If third vertex is $(– 2, 1)$ then the coordinates of the fourth vertex are 

• A

  $(1, 0)$

• B

  $(0, 0)$

• C

  $(1, 1)$

• D

  none of these