Who or what are the antagonists for the three short stories, "The Necklace," "A Rose for Emily," and "A Worn Path"?

In all three novels, society in some shape or form is the antagonist.

In "The Necklace", Mathilde's antagonist is her class and social consciousness, stemming from how she viewed herself as a member of society- which is as a very unfortunate person wanting to move forward, but not being able to.

In "A Rose for Emily" social change is Emily's antagonist. The Old South's changes are unbearable to her, and she has determined to not face it and stubbornly keep tight to what she knows which is the past. Change is a huge antagonist, but Social Change is the biggest of them all.

In "A Worth Path" the antagonist is Social Struggle. Phoenix goes through a number of obstacles to get a basic need: medicine. But she is an old, african american woman and her path is obstaculized by a number of elements. All this just to get medicine. Therefore, in this story the struggles of African Americans are represented in Phoenix's own struggle to get to the most simple and rightful place for her to be.

I hope this helps!