Help me do this please :(

How does the author's purpose affect his or her text structure

The book the sweet-hereafter; in section four, which of the following is the extended metaphor for nichole's mental state. a) the room her father built her from the sun-room b) the wheel chair she sits in c)the computer from mr. stephens d) the teddy bear from her childhood

In your own words, explain the purpose and impact an adjective clause has on a reader