Choose the sentences which can be S2 and S3. S1: The Union and Confederacy quickly raised volunteer and conscription armies that fought mostly in the South over the course of four years.  S2: S3: S4: Four years of intense combat left 620,000 to 750,000 people dead, more than the number of U.S. military deaths in all other wars combined  P. It was  followed by a series of surrenders by Confederate generals throughout the southern states. Q. Much of the South's infrastructure was destroyed, especially the transportation systems R. The Union finally won the war when General Robert E. Lee surrendered to General Ulysses S. Grant at the Battle of Appomattox Court House.

Choose the sentences which can be S2 and S3. S1: The Union and Confederacy quickly raised volunteer and conscription armies that fought mostly in the South over the course of four years.  S2: S3: S4: Four years of intense combat left 620,000 to 750,000 people dead, more than the number of U.S. military deaths in all other wars combined  P. It was  followed by a series of surrenders by Confederate generals throughout the southern states. Q. Much of the South's infrastructure was destroyed, especially the transportation systems R. The Union finally won the war when General Robert E. Lee surrendered to General Ulysses S. Grant at the Battle of Appomattox Court House. Correct Answer RP

R must be S2 as it states the outcome of the war. P should follow R as both talk about surrenders.

Thus option 3 is the correct answer.