The Owl of Minerva, Hegel Tells Us, Spreads Its Wings

The owl of Minerva, Hegel tells us, spreads its wings only at dusk. This means that

A) owls can see better at night than in the daytime.
B) Hegel believes in the old Greek gods.
C) philosophers are the only ones wise enough to give instruction as to what the world ought to be.
D) the world can be understood only retrospectively.