The inference is that the author mainly explains the importance of Pan Gu by D. describing how Pan Gu became the ancestor for all human life.
It should be noted that an inference simply means the conclusion that can be deduced based on the information given.
In the story, the heavens and the Earth began to grow at a rate of 10 feet a day, and Pan Gu grew along with them. After another 18,000 years the sky was higher and Earth was thicker. Pan Gu stood between them like a pillar 30,000 miles in height, so they would never again join. This occured when Pan Gu was born.
Therefore, the inference is that the author mainly explains the importance of Pan Gu by describing how Pan Gu became the ancestor for all human life.
In conclusion, the correct option is D.
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