Prior to the United States' Construction of the Panama Canal

Prior to the United States' construction of the Panama Canal,

A) the French had failed to build a channel at the same site.
B) the United States had failed to build a canal across Nicaragua.
C) the British had failed to build a canal across Costa Rica.
D) the Germans had failed to build a canal at the same site.
E) no country had attempted to build a canal connecting the Atlantic with the Pacific.