Which best corrects the run-on sentence? Auroras illuminate the northern horizon they have a greenish glow or sometimes a faint red one.

AAuroras illuminate. The northern horizon in a greenish glow and sometimes a faint red one.

BAuroras illuminate the northern horizon. With a greenish glow or sometimes a faint red one.

CAuroras illuminate the northern horizon. They have a greenish glow or sometimes a faint red one.

DAuroras illuminate the northern horizon, a greenish glow or sometimes a faint red one.