the author is reflecting on the past and it has something to do with the present
D) OMIT the underlined portion.
Archaeologists often begin their analysis when they return with the artifacts to a safe place, such as a laboratory. It sounds way better like this and it wouldnt sound right with any of the other options.
^_^
Totally a glove! The fingers point the way, gloves don't move easily when blown by the wind, the two skins are the glove skin and the person's skin.
I believe the answer is C. motivation.