The amount of geological activity occurring on a terrestrial planet is related

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The amount of geological activity on a terrestrial planet is related to both its size and the amount of internal radioactive heating. The larger the planet, the more likely it is to have enough gravity to retain heat in its core and generate geological activity. Additionally, the amount of internal radioactive heating a planet has will also contribute to its geological activity. Therefore, neither distance from the Sun (A) nor size alone (D) can fully determine a planet's geological activity. B is incorrect because although internal radioactive heating is a factor, it is not the only factor.

The Amount of Geological Activity Occurring on a Terrestrial Planet