The rising of warmed air by creating a high-pressure system below, is not a part of a normal convection cycle.
A continuous process of the rising of warmer areas of gases or liquids, and the sinking motion of the cooler ones is known as a convection cycle.
In a convection cycle, the warmed air cannot rise by creating a high pressure surface below and flowing away from the surface.
Hence, option D holds true regarding a convection cycle.
Learn more about a convection cycle here:
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