Who is the happiest person?按照幸福度排序（考心理）

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DCBA
D:knowing nothing about it ,always think she is the happiest wife in the world
C:she is A's lover ,so she had gotten the hot  love .
B:after knowing her husband's affair  ,she made an assertive  to divorce.
A:He always live in a world of  worry .because he doesn't  want D to know his dirty history