Which statement was NOT a strategy used by American engineers to dig the Panama Canal? The canal was built to sea level, allowing ocean water to fill the canal.
The main excavation took place in the Culebra Cut.
The creation of Gatún Lake reduced the need for digging.
A series of locks on each end of the Canal lifts ships to the lake.

A.

Explanation:

The Pacific Ocean side is higher than the Atlantic. Water used to lift ships up and down across Panama isthmus, comes from fresh water lakes Gatun and one other, not salt water.

b is correct

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