The right answer for the question that is being asked and shown above is that: "d. Peace Democrats." Copperheads was a term that referred to Northern Peace Democrats. Being a peace democrat, you have to bear a big responsibility in terms of peace within the area.
1900's is when they increased most
The Siege of Vicksburg was important to the Union troops because they were able to take control of the Mississippi River. This allowed the Union troops to cut the Confederacy in half and allowed the Union to cut of supplies/resources to Confederate states.
The Battle of Gettysburg was an important Union win because this was the last time in the Civil War that the Confederate troops truly invaded the North. After this battle they did not invade any state north of Pennsylvania.
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answer A hope this helps :)