Help please!! why is grammar important/matter?

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.