Four teams take part in a week-long tournament in which every team plays every other team twice, and each team plays one game per day. The diagram below on the left shows the final scoreboard, part of which has broken off into four pieces, as shown on the diagram below on the right. These pieces are printed only on one side. A black circle indicates a victory and a white circle indicates a defeat. Which team wins the tournament?

I have tried solving this problem as a puzzle, trying to fit in the pieces. I get the answer as D. ... Is 'D' the correct answer? ... Please advise.