The answer is D
Tû’s descendants became the Mâori, the humans who are able to master anything that they decide to conquer.
It is C. The central idea of the text is
Give more detail to the question
Internal: happens on the inside.
It depends what “internal detail” do you want, but if it’s a character’s internal details it basically has to do with their thoughts, feelings, traits and what they’ve been through or experienced.
If you mean the internal detail of an object, like a house, it has to do with the number of rooms in the house, the measures, etc.