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What does the carriage symbolize in this excerpt from Emily Dickinson’s “Because I Could Not Stop for Death”?

Because I could not stop for Death – He kindly stopped for me – The Carriage held but just Ourselves – And Immortality. We slowly drove – He knew no haste And I had put away My labor and my leisure too, For His Civility –

A. immortality
B. fate
C. life
D. death