Which of the following best describes a central idea of the text ?
a: if the battle of gettysburg had not occurred by accident, the confederate ark would have suscessfuly invaded the north.
b. the battle of gettysburg was a pivotal battle lost by the confederacy that discouraged any other attempt to invade the north.
c. the battle of gettysburg did not benefit either the union or the confederacy because of the high number of lives lost ?