Hi everyone ; ) why do you think happened on earth that made the scientist create ember? (the city of ember novel)

Read the summary of the first three paragraphs of “the world on turtle’s back.”[1] in the beginning, there was no land, only the great ocean. [2] the sky-world, the home of the gods, was above the ocean. [3] a sacred tree stood at the center. [4] one of the gods pulled out some of its roots for his pregnant wife. [5] this created a hole in the floor of the sky-world. [6] the man's wife fell through the hole toward the ocean below, clutching the roots in her hand.which is the best way to combine sentences 4 and 5? a) one of the gods pulled out some of its roots for his pregnant wife, which created a hole in the floor of the sky-world.b) one of the gods pulled out some of its roots for his pregnant wife, he created a hole in the floor of the sky-world.c) one of the gods pulled out some of its roots for his pregnant wife which created a hole in the floor of the sky-world.d) one of the gods pulled out some of its roots for his pregnant wife he created a hole in the floor of the sky-world.