Knowing the fact that earth is round shaped and that we are living on the crust, how is it possible for all of us to balance irrespective of where we live on earth ?

Question

$\begin{array}{1 1} (a)\;\text{due to pressure by human body } \\ (b)\; \text{due to gravity}\\ (c)\; \text{due to external pressure} \\ (d)\; \text{due to magnetic pressure} \end{array}$