Answer:
B. An important victory for the abolition movement.
Explanation:
I majored in History
Amistad mutiny (1839) slave rebellion that took place on the slave ship Amistad near the coast of Cuba and had important political and legal repercussions in the American abolition movement.
An absolute phrase modifies a noun, and it doesn't contain a verb. Having this in mind, the absolute phrase in this sentence is those living and dead.
