The correct order of the flow of energy from its production within the sun until it reaches Earth is:
nuclear fusion; radiation; convection currents; radiation
In this process, nuclear fusion occurs in the core of the sun, producing energy in the form of radiation. This energy then travels through the radiative zone, where it is transmitted by radiation. Eventually, it moves into the convective zone, where convection currents help carry it to the sun's surface, after which it radiates into space and travels to Earth.
So, the correct response is:
nuclear fusion; radiation; convection currents; radiation