When Archaeologists Excavate a Site, They Always

When archaeologists excavate a site, they always

A) refill the site with the unimportant artifacts when they are finished, since they may be of value later.
B) excavate a small part of a site to preserve the site for future archaeologists.
C) excavate as much as they can of a site to try to record as much of the context of the artifacts as possible.
D) nonintrusive techniques like ground-penetrating radar and sonar to avoid destruction.