The correct answer is option 3, France. France has the maximum number of running nuclear reactors among the given European countries. It is important to note that each option represents a different European country, and we need to determine which country has the most running nuclear reactors.

Option 1, Germany: Germany is known for its energy transition efforts, and it has been actively reducing its reliance on nuclear power. As of 2021, Germany has shut down all of its nuclear reactors, making it an incorrect answer.

Option 2, Switzerland: Switzerland does have nuclear reactors, but it has a lesser number compared to France. Therefore, it is not the country with the maximum number of running nuclear reactors.

Option 4, Norway: Norway does not have any nuclear reactors, so it is not the correct answer.

Alert - Correct answer should be: France. France has a significant number of operating nuclear reactors, making it the European country with the highest number.