A. controlling the current
B. building locks and canals
C. changing the direction of flow
D. clearing the river of water weeds
Correct Answer: Option B
B. building locks and canals
A. controlling the current
B. building locks and canals
C. changing the direction of flow
D. clearing the river of water weeds
Correct Answer: Option B
B. building locks and canals
Copyright warnings! Do not copy.