The Long-Term Study of an Earthwork Constructed at Overton Down,England,as

The long-term study of an earthwork constructed at Overton Down,England,as experimental archaeology indicates that

A) preservation was better in the chalk bank,and preservation of leather and pottery was unchanged after 4 years
B) preservation was superior in the turf core,and preservation of textiles and other organic material had changed little after 4 years
C) preservation was quite poor regardless of whether artifacts were in chalk or turf,primarily because of rodent and earthworm activity
D) archaeologists have been underestimating the effects of earthworm activity on preservation and site formation processes