Why were the alternative Dunkerque preliminary designs rejected?
Short answerThe selected design best matched the industrial and operational needs the French were trying to satisfy.
NotesThe preliminary designs represented a range of options for the same procurement decision. Selection depended on which option best met the needs France was trying to fill. Dunkerque was judged the best fit for the available industrial arrangements and the intended operational role. A separate technical rejection reason for every alternative is not established, and the captions garble the tonnage list in the question.