Which of the Following Scenarios Unfolded at the Battle of Gettysburg

Which of the following scenarios unfolded at the Battle of Gettysburg in July 1863?

A) Pickett's charge at the heart of the Union line was a costly blunder that forced a Confederate retreat.
B) Confederate troops flooded in from the west and,within a day,vastly outnumbered Union troops.
C) Lee's army initially drove the Union troops from the battlefield but could not pursue Meade's army without reinforcements.
D) Confederate forces refused to engage the Union army directly,resulting in a stalemate that ultimately led both sides to withdraw.