Why Were Adams and Le Verrier Acknowledged as the Discoverers

Multiple Choice

Why were Adams and Le Verrier acknowledged as the discoverers of the planet Neptune?

A) They were the first to see it through a telescope.
B) They took time-lapsed photos to show its motion across the sky.
C) They predicted its position based on the observed discrepancies in the orbit of Uranus.
D) They were the directors of the observatory at which it was discovered.
E) They paid for the observations that discovered it.