Consider the earth to be a homogenous sphere Scientist A goes deep down in a mine and scientist B go

Question

Consider the earth to be a homogenous sphere Scientist A goes deep down in a mine and scientist B goes high up in the balloon. The gravitational field measured by\

Professor PC Thomas Classes · Answer

The paper setter has clearly not considered a depth that crosses the centre of the earth. So we choose the most appropriate choice, each goes on decreasing.