SAT US History Practice Question

The primary reason the Confederate Army lost the Battle of Gettysburg was that

1. A.the Union troops did not have sufficient reinforcements to win the battle
2. B.Confederate General Robert E. Lee was a strategically gifted commander
3. C.the Union forces were able to hold the high ground northwest of Gettysburg
4. D.the Confederate troops retreated south after Pickett's Charge
5. E.Union troops vastly outnumbered the Confederates