Because if it had four it'd be a chicken sedan.
Ali-luyah at last you've opened the door!
Open the door. Put in the elephant. Close the door.
A hatchback.
A chicken sedan
Because if it had 4 doors it'd be called a chicken sedan. (better if saying it out loud because of the spelling of coop/coupe) -
Two. If there were four, it would be a chicken sedan