(c)
Intersection points of given circles are (0, 0) and (3, 3) let equation of required circle whose centre $\left( \frac{3}{2},\frac{3}{2} \right)$, is
$x^{2} + y^{2} - 3x - 3y + c = 0$
Since, this circle passes through (0, 0), thus equation of circle becomes,
$x^{2} + y^{2} - 3x - 3y = 0$