Citroen's C2 is the replacement for the Saxo at the bottom end of the French car manufacturer's range. Based on the same platform as the slightly larger C3 and C3 Pluriel, the C2 is only available as a three-door model because the C3 covers five-door territory.
C2 : The rear windows do not, unfortunately if you're in the back, open. Well, it's not that unfortunate in winter, but in summer months, you'd better hope your driver has specified air conditioning. Which means you need to be in an SX with an option paid for, or in a Furio or VTR with an even bigger option paid for. If not, prepare to sweat away back there.