The reader can tell from the Article that
A. Marcello A. Canuto probably plans to try and prove that only about 5
million people lived in Guatemala's Petén region.
B. Most researchers probably don't believe there are any ancient structures
hidden in a Guatemalan jungle.
C. Researchers probably want to learn more about the structures that
showed up on the lidar map of Guatemala's Petén region.
D. Thomas Garrison had probably never heard of the Maya civilization before
taking part in the lidar mapping project?