Let $k$ be an integer such that the triangle with vertices $(k, -3k),\; (5, k)$ and $(-k, 2)$ has area 28 sq. units. Then the orthocentre of this triangle is at the point :

Question

( A ) $(2, \frac{1}{2})$
( B ) $(1, \frac{3}{4})$
( C ) $(2, -\frac{1}{2})$
( D ) $(1, -\frac{3}{4})$