The correct response regarding the total energy at point S is:
At point S, the total energy is equal to the total energy of the system because kinetic energy has been transformed to potential energy.
In a closed system, the total mechanical energy (the sum of kinetic and potential energy) remains constant, assuming no external forces (like friction) are acting on it. As kinetic energy is transformed into potential energy or vice versa, the total energy of the system does not change.