The correct option is option (D)
The energy is transferred through cycling of hotter and cooler materials in the Convection zone
In the convective zone of the sun the energy is transferred much faster through the process of convection.
The most efficient means of energy transfer is convection and happens in the region of the Sun's interior know as the convection zone.
The hotter material near the top of the radiation zone (the bottom of the convection zone) rises up and the cooler material sinks to the bottom.
As the hot material reaches the top of the convection zone it begins to cool and sink, and as it sinks it heats up again and will rise.
The hot material follows a direct path through the convective zone and the energy is transferred much faster than it is by radiation.
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