Car B is (old)
Car B is the oldest
Car B has (many) doors
Car B has the most doors
Car A is (cheap)
Car A is the cheapest
Car A has the (small) engine
Car A has the smallest engine
Car C has the (large) engine
Car C has the largest engine
Car A has the (many) kilometers on the clock
Car A has the most kilometers on the clock
Car C is (expensive)
Car C is the most expensive
Car A has the (small) engine
Car A has the smallest engine