Which is the BEST example of how the physical geography of the region slowed the construction of the Panama Canal?
a. Protests from the local citizens of Panama interfered with American work schedules.
b. Many workers were killed or sickened by malaria and yellow fever carried by mosquitoes.
c. Arguments between government leaders of the United States and Panama slowed its construction.
d. American contractors were forced to bring in new equipment to replace older, outdated French equipment.