Explanation:
It is something which you can do beyond your expectations it means to cross the boundary, it means to challenge yourself, it also means to go beyond your limitations
I would explain with an example: if you want to learn Japanese in 3 months and you do it in 1.5 month then you have challenge yourself and gone beyond your expectation and you have defeated your limitation .
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Answer:
The answer is sentence A.
The correct answer is A. In the Gettysburg Address, saving the Union is the focus. President Abraham Lincoln delivered two of the greatest speeches in American history during the Civil War from 1861 to 1865, Gettysburg Address and Second Inaugural Address. The inaugural address was devoted altogether to saving the Union without war. Both parties had different thoughts, and the war came.