Was the Civil War a "Modern" War? Why or Why

Was the Civil War a "modern" war? Why or why not?

A) No, it was not a "modern" war because the technology of photography had not yet emerged to document the fighting and destruction.
B) No, it was not a "modern" war because the effectiveness of muskets, rifles, and cannons had not improved much in decades and encouraged bloody, close combat.
C) No, it was not a "modern" war because it never reached the scale of intercontinental alliances, and multinational armies never materialized.
D) Yes, it was a "modern" war because advancements in technology enabled it to result in very few casualties relative to other wars in American history.
E) Yes, in many ways it was a "modern" war because it was fought across the continent, with armies using railroads and steamships for the first time.