The word "outskirts" most nearly means outlying areas.
The outskirts of a town or city are the areas that are farthest away from the center. They are often less developed than the center of town and may have more open space and greenery.
The other options do not have the same meaning as outskirts.
Apartments are buildings that contain multiple housing units.
Apparel is clothing and other items worn on the body.
Beaches are areas of land along the edge of a body of water, such as an ocean or lake.