The statement which best describes the purpose of the horse-drawn carriage imagery in "Because I Could Not Stop for Death" is:
The imagery introduces the idea that death is a natural and ordinary part of one's journey through life.
The poem “Because I Could Not Stop for Death" is about the journey of death away from the life. Her experience with death who comes to take her to the world away from the worldly pleasures is the main theme of the poem. She tells about the things which she encounters through her journey towards her grave. Her feelings for her death is not frightening, rather a practical and different experience.