Unlike union soldiers, confederate soldiers were negatively affected by
a. advanced weapons.
b. a sea blockade.
c. a lack of nurses.
d. the writ of habeas corpus.

Option: B. A sea blockade.

Explanation:

Confederate soldiers were negatively affected by the sea blockade because it was the only way the South could get the supplies for war from Europe. Union Blockade tried to stop the food supplies, troops, and weapons from entering the Confederate states. The Union thought they could hit the economy of the Southern states.  

here you go hope it heps "horace mann"

i beleive that d is the right answer