Coche

Situation: Four travelers rent a car to travel around Bariloche. The car is manual. You must be 21 to drive it and have a licence. Argentine´s drive on the right side of the road.

Liam: 21, has a licence, can´t drive manual, is from Aussie land and therefore is used to driving on the left side of the road.
Chiara: Knows how to drive manual, not 21, lost her licence, drives on the left side, hasn´t driven in two years.
Tessa: 21, drives on the right side, knows how to drive manual, lost her licence, doesn´t know how to drive up hills, doesn´t know how to use a hand break.
Erin: drives on the right side of the road, has licence, doesn´t know how to drive manual, not 21.

Question: Who drives the car?