Which of the following are two MAIN ideas of the article?
(A)There were several civilizations that rose and fell in Mesoamerica before Europeans finally conquered
the land; each civilization is known for different achievements.
(B)The Olmecs founded the original Mesoamerican culture; their traditions influenced the civilizations built
by the Mayans and Aztecs later on.
(C)The Mayans and the Aztecs built the most famous civilizations in Mesoamerica; there were also other
civilizations in the area that historians do not know much about.
(D)Mesoamerican civilizations made advancements in many areas; these advancements were lost when
the Europeans later invaded their land.