What do the authors of South Carolina's Declaration of the immediate Causes of Secession present as the cause of their leaving the Union? O a the North's increasing opposition to slavery

O b. the election of a president who received no votes from the southern states

O c. the federal government's refusal to endorse the Ostend Manifesto

Od the Supreme Court's hostility to the interests of slave owners

e. the federal government's refusal to respect states' rights

dom