Rent A Car In Sofia - Compact Cars, or Group C Rental Cars by car rental Bulgaria include vehicles smaller than a mid-size car, but larger than a economy car. In Europe, the term small family car is used for compact cars. The Group C 5-door Compact cars offer great value for money. With more space for luggage and passengers than the small, economy cars of Groups A and B, compact cars can be worth their slightly higher rental rate. With an increased capacity, the compact cars still offer great mileage and small size for driving in big cities and parking in small spaces.