The united states and canada have worked together to construct on the st. lawrence seaway.
a. a hydroelectric plant
b. highways
c. locks
d. a canal

The United States and Canada have worked together to construct locks on the St. Lawrence Seaway. The correct option among all the options that are given in the question is the third option or option "c". I hope the answer has come to your help.

F=31 because you subtract 39-8