Which One of These Processes Was Important for Melting the Entire

Which one of these processes was important for melting the entire Earth about 4.6 billion years ago?

A) heat released by the condensation of water vapor into liquid water to form the ocean
B) radioactivity, or the spontaneous breaking apart of heavier nuclei into lighter ones
C) nuclear fusion, or the combining of lighter nuclei to form heavier ones
D) tidal heating of Earth due to the combined gravitational pulls of the Sun and the Moon

Correct Answer:

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