Despite the High Temperatures Deep in the Interior of Giant

Despite the high temperatures deep in the interior of giant planets, their cores remain liquid because

A) they are under very high pressures.
B) gravitational potential energy is being converted into thermal energy in the cores.
C) they are composed of heavy materials like rock and water.
D) their rotations are rapid compared to those of the terrestrial planets.
E) the giant planets have strong magnetic fields.