DNA Replicates Mostly Accurately Due to Consistent Base-Pairing

DNA replicates mostly accurately due to consistent base-pairing. What does that mean?

A) Every base in a paired DNA molecule is the same.
B) When the base of a DNA molecule lines up with the base of another, they are always consistent.
C) Base A always pairs with base C, and T with G, so accurate replication is easy.
D) Base A always pairs with base T, and C with G, so accurate replication is easy.
E) DNA actually mutates a lot, so replication isn't all that accurate.