The correct statement about the flow of thermal energy inside Earth is:
Energy flow inside the mantle causes magma to rise.
In the mantle, heat from the Earth's core causes convection currents, leading to the rise of magma. As magma warms up, it becomes less dense and rises towards the crust, while cooler, denser magma may sink back down. This process is part of the geological processes that drive plate tectonics and volcanic activity.