A midden is .
a.
A shiny, usually black, volcanic glass.
c.
A mound or deposit containing shells, animal bones, and other refuse that indicates the site of a human settlement.
b.
A piece of broken pottery, especially one found in an archaeological dig.
d.
A row of buildings erected on raised ground or on a sloping site.

Please select the best answer from the choices provided

A
B
C
D