A.) They were forced to move westward
"<span>To create a shorter route to ship goods between the Pacific and Atlantic oceans</span>" was by far the primary goal of building the Panama Canal.
The policy described is domestic policy as it takes place within U.S. borders. The answer can't be foreign policy as that would be policy applying outside the country. Neither can it be either of the other two because the question has nothing to do with the functions of trade or judiciary "law making" via the interpretation powers granted to the judicial branch.
The answer would be C. ten provinces.
