What is hypothesized to have caused the early primitive oceans to form our planet

Explanation:

The primitive oceans formed from volcanoes at the beginning of time. When they blew up they released water vapour into the air. As the earth's crust cooled down, the water vapour condensed forming clouds, and water. The water fell as rain, which went down into the basins forming oceans. Scientists think they formed 4 billion years ago.

the aswer is letter c

i believe it would be the lungs.