Question
18. For centuries, historians have studied the ancient civilization.
of the Maya to gain insight into their advanced knowledge of
mathematics, astronomy, and agriculture. Despite their
impressive achievements, the Maya were eventually
by a combination of environmental factors, overpopulation,
and political instability. Which choice completes the text so
that it conforms to the conventions of Standard English?
A) collapse
B) collapsed
C) collapsing
D) to collapse