What is the difference between a reason and an example? (when writing an essay)

In what way was the modernist element of disillusionment shown in “the jitling of granny weatherall”? a) the story rejects traditional, chronological order. b) granny feels jilted at both her wedding and her deathbed. c) the narration makes heavy use of symbolism. d) granny’s thoughts are hard to distinguish from real events