Supporting sentences in the body of an illustration paragraph serve what purpose?
A. They provide an interesting idea that grabs the attention of the
reader.
B. They wrap up the paragraph and restate the main idea,
C. They provide one extended example of the main point introduced
in the topic sentence.
D. They state the main idea of the whole paragraph.

[1] when the twins grew up, they continued to fight. [2] one day they decided to hold a contest to determine who was stronger. [3] though they tried to defeat each other in many different ways, neither one could win. [4] on the last day, they fought with weapons. [5] using a deer antler, the right-handed twin overpowered his brother, and he threw him off the edge of the earth. [6] today, the right-handed twin lives in the sky-world, and the left-handed twin lives in the dark underworld. [7] they rule the earthly world of men together.