Correct answer wasn't listed: Chaotic Evil. So I said Avocado.
Lawful, you say? Then why is it every edition tells us something different, and usually at least somewhat inconsistent, with previous editions? Why does the Book of Exalted Deeds contain totally-not-poisons that are perfectly safe for Good people to use? Why do people repeatedly read direct instructions that alignment isn't supposed to be a straightjacket, and then immediately start applying it as a straightjacket? Why are there 17 outer planes? It's got "rules," sure, but those rules are incredibly arbitrary, enforced haphazardly, and absolutely riddled with dumb exceptions and weird contradictions.
Alignment, as it appears in D&D, is fundamentally insane and often destructive. It doesn't behave with any consistency (despite its many fervent claims to the contrary), except that it consistently messes up things for an awful lot of players. It has directly supported both bad-faith DM arguments and bad-faith player arguments. Would such arguments still happen without it? Some of them, I'm sure, but I don't for a second believe that all of them would have.