Go for b (filler: jdjdmfmrnnfmfjxjdk)
The best events that foreshadow the ending for "A Rose for Emily" are:
1) When Homer Barron goes missing in the town.
2) When the strange odor starts to come out of Ms. Emily's house.
3) When Ms. Emily buys rat poison to deal with a "pest."
4) When the town says, "He has been heard to say he is not the marrying type."
A poetic device is a tool that serves different purposes in a poem. Some of them are ornamental, some enhance the meaning of the poem and others add to its rhyme and lyricism. The most common poetic devices are alliteration, repetition, metaphor, simile, personification, etc.