The correct answer is option 3: Sweden. Sweden has set up an ambitious goal to achieve a completely oil-free economy by the year 2020. This means that they aim to reduce their dependence on oil for energy and transportation and transition to renewable sources of energy such as wind and solar power.

Option 1: Canada is not the correct answer. Canada is known for its rich natural resources, including oil, and does not have a goal to achieve a completely oil-free economy by 2020.

Option 2: USA is also not the correct answer. While there are efforts in the United States to transition to renewable energy sources, there is no specific goal to achieve a completely oil-free economy by 2020.

Option 4: Australia is not the correct answer either. While Australia has made some progress in transitioning to renewable energy, there is no specific goal to achieve a completely oil-free economy by 2020.

In conclusion, the correct answer is option 3: Sweden, as they have set an ambitious goal to achieve a completely oil-free economy by 2020.