Life expectancy is highest in the world in

1. The question asks in which country the life expectancy is highest in the world, relevant to the time around 2003. 2. Global life expectancy rankings consistently place countries like Japan, Switzerland, Spain, Singapore, and Australia near the top. 3. Among the options provided (Canada, Germany, Japan, Norway), Japan typically had the highest or one of the very highest life expectancies at birth globally during the early 2000s. 4. Therefore, the correct answer is (C) Japan.