Based on the sequence of events in the excerpt, which sentence best states a cause-and-effect relationship?
O Because so many graves were robbed, grave-
robbing was considered a terrible crime.
O Because none of the precautions they took were
effective, the pharaohs found a new burial ground in
the Valley of the Kings.
O Because the graves were so heavily protected, there
were very few instances of grave robberies in
ancient times.
Because there was only one way to enter most
burial chambers, grave robbers were often stopped.