What were effects of the Ostend Manifesto and the caning of Charles Sumner? A) The South agreed that the secrecy of the manifesto and beating of a senator were both wrong.
B) The South gained more land in Cuba to expand slavery and silenced a northern senator.
C) Northerners were outraged that the South had used such methods in support of slavery.
D) Northerners were outraged that the South had invaded Cuba and killed a U. S. senator.

Northerners were outraged that the South had used such methods in support of slavery.

Explanation:

Both events outraged northerners and abolitionists who believed the South had used secrecy and violence to further the cause of slavery.

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imma say false because i dont know anything about this.