The correct answer is C) to establish a blockade of Southern ports
Unfortunately, you forgot to attach the map. Without it, we do not what you are talking about.
However, trying to help you, we did some deep research and found that you are talking about the Red River Campaign. If that is the case, then the correct answer is the following.
A major goal of the campaign shown in this map is "to establish a blockade of Southern ports."
The Union Army started the Red River Campaign on March 12, 1864. The Union troops began the operation by moving boats and men to the Red River in Louisiana, The goal was clear: to capture key Confederate positions along the River and to establish a blockade of Southern ports. The Union army wanted to capture Shreveport, Louisana, the capital of the Confederates in that state. The idea was also to the incursion into Texas territory to capture. However, the Union failed and the victory was to the Confederate troops.
