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The correct answer to the question is option 1, Volocopter. This option is the world`s first green helicopter that has been successfully tested in Germany recently. Volocopter is known for being environment-friendly and emission-free, making it a sustainable and innovative solution in the aviation industry.
Option 2, Sikorsky, is not the correct answer because it is a well-known helicopter manufacturer but it has not been specifically mentioned in the question that Sikorsky has recently tested a green and emission-free helicopter in Germany.
Option 3, Eurocopter, is also not the correct answer as there is no mention of Eurocopter being tested in Germany as the world`s first green and emission-free helicopter.
Option 4, Bell, is not the correct answer as there is no mention of Bell being tested in Germany as the world`s first green and emission-free helicopter.
In summary, Volocopter is the correct answer to the question as it is the world`s first green helicopter that has been successfully tested in Germany recently, making it environmentally friendly and emission-free.