What event was an immediate cause of the Civil War? A the return of runaway slaves to the South
B the publication of the Ostend Manifesto
C the Dred Scott court case
D the bombing of Fort Sumter by Confederate forces

D

Explanation:

After tensions were on the rise and the south officially seceded from the Union, after they fired on Fort Sumter war was declared shortly afterwards.

i told you before its c

c. the dred scott v. sandford case,