Read the summary of the conclusion of "the world on turtles back" [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 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.

Which best describes sentence 1?

a. It is a complex sentence
b. It is a compound – complex Sentence
c. It only has one class
d. It has three separate clauses