Answer:
on a wide, isolated expanse of farmland.
Step-by-step explanation:
Indeed, after reading the short story "Good Country People," by Flannery O'Connor. It is important to recall that we told, "Mrs. Hopewell....needed someone to walk over the fields with her."
Hence, based on Mrs. Hopewell's attitude toward the fields, it is thus reasonable to infer that the story takes place on a wide, isolated expanse of farmland. Her comments thus indicate that Mrs. Hopewell lives in isolation and therefore needs the company of Joy as she walks over the isolated expanse of farmland.