To order the activities from the greatest to least impact in terms of reducing fossil fuel consumption, we should consider the level of energy consumption and emissions associated with each option.
- Walk to work - This has the greatest impact since it uses no fossil fuels.
- Carpool to work - This reduces the number of vehicles on the road, leading to lower overall fossil fuel consumption compared to driving alone.
- Drive an electric car to work - While electric cars have a lower carbon footprint than traditional vehicles, they still may rely on fossil fuels for electricity generation depending on the energy source of the grid.
- Drive alone to work - This has the least impact since it involves no efficiency from sharing a ride.
Based on this analysis, the correct ordering, from greatest to least impact, is: walk to work, carpool to work, drive an electric car to work, drive alone to work.
The closest response to this order is: walk to work, carpool to work, drive alone to work.