(A) the proportion of judges and partners at major law firms who are women have not risen to a comparable extent - proportion is singular
(B) the proportion of women judges and partners at major law firms have not risen comparably -proportion is singular
(C) the proportion of judges and partners at major law firms who are women has not risen comparably- 'has' is used correctly. Correct
(D) yet the proportion of women judges and partners at major law firms has not risen to a comparable extent
...
(B) the proportion of women judges and partners at major law firms have not risen comparably -proportion is singular
(C) the proportion of judges and partners at major law firms who are women has not risen comparably- 'has' is used correctly. Correct
(D) yet the proportion of women judges and partners at major law firms has not risen to a comparable extent
...

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