If the interior contained matter is of same density everywhere, then we assume earth approximately as a point mass of mass equal to mass of earth, placed at the centre of earth. In that case, acceleration due to gravity (g) is zero at the centre of the earth. But it can’t be zero at any point on the surface of the earth.
The magnitude and direction of acceleration due to gravity can not be predicted at every point on the surface if the mass density is non - uniformly distributed everywhere. So, options(a), (b) and (c) are incorrect.
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