Archaeology is the study of:

Archaeology is the scientific study of human history and prehistory through the excavation of sites and the analysis of artifacts and other physical remains. Therefore, its primary focus is the investigation of past things related to human activity and culture. While it indirectly involves 'human kinds' (societies) and can analyze 'animals' and 'plants' (paleoethnobotany, zooarchaeology) in the context of human interaction, the most encompassing and accurate definition among the choices is the study of 'Past things' to reconstruct human past.