The correct option is a. All the sites mentioned are archaeological sites.
An archaeological site is a location that has been or may be explored using the field of archaeology and preserves traces of previous activity. It forms a part of the archaeological record. Sites might include those with few or no remains that are visible above ground, as well as buildings and other facilities that are still in operation. Almost always, it is challenging to delimit a site. Although the archaeologist must additionally specify the boundaries of human activity around the site, it is commonly assumed to imply some form of habitation. A site can also be created by any episode of depositing, including a hoard or burial.
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