The 2 1916 battles would be The Battle of Marne and The Battle of Verdun
Karl Marx published The Communist Manifesto and Das Kapital
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I believe that answer is (C)
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b. Opposed violence to achieve an end to slavery.
Shortly after the Revolutionary War, several slave-holders, uneasy over bondage in a country of liberty, declared that servitude was an "intrinsic evil." By the 1830s, as abolitionist assaults on bondage strengthened, slaveholders now maintained captivity was a "positive good."
Abolitionist members of William Lloyd Garrison commonly encountered violence to accomplish an end to servitude. Garrison was the preeminent defender of "immediate emancipation." Other abolitionists requested for a progressive abolition or expansion. Garrison desired to end captivity but did not promote brutality to accomplish his purposes.