d
The centrifugal force due to spinning of earth is maximum at the equator and vanishes at the poles. So, the effective gravitational acceleration is minimum at equator and maximum at poles.

The value of acceleration at height \(h\) is \(g_h=\frac{ GM }{( R + h )^2}\) and at depth \(d\) is \(g _d=\) \(\frac{ GM }{( R - d )^2}\)

Thus, the value of \(g\) is more at the earth's surface than at a height above or a depth below.