To use his beliefs as support for her argument is the reason of Mrs. Westmacott say this to the Doctor. Mrs. Westmacott believe in the liberty of women is very important.
Giving the liberty to the women helps the women to pursue their career and gets the ability to decide their good or bad by their own.
Women are not dependable on anyone if they get the right education of the rights and support, and confirming the removal of governmental barriers to women's employment.
Thus, option A is correct.
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