Sum of the exterior angles of a heptagon is?

(a) ${720}^{\circ}$ (b) ${900}^{\circ}$ (c) ${180}^{\circ}$ (d) ${360}^{\circ}$

(d) ${360}^{o}$
Whatever the number of sides of a polygon, sum of exterior angles of a polygon is always ${360}^{o}$.
Hence sum of exterior angles of this polygon too will be ${360}^{o}$ and answer is (d).