The locus of the centre of a circle whic...

The locus of the centre of a circle which cuts the circles `2x^2 + 2y^2-x-7=0 and 4x^2 +4y^2-3x-y =0` orthogonally is a straight line whose slope is (A) `-1` (B) 1 (C) `-2` (D) `-5/2`

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