How were wealthier classes in Pride and Prejudice limited in terms of their choices Provide evidence and quotes

The social structures of the period limited the ways in
which people could behave without being ostracized from their social circle. For
example, only certain forms of employment were acceptable for "gentlemen" -- being an
officer in the military, clergy, and, to a limited degree, law and medicine. Often men
with no interest in or talent for those occupations fell into them due to social
restrictions. Women of the gentry were expected to marry gentlemen -- to marry
inappropriately or to earn one's own living was to remove oneself from the
social category of gentlewoman (governesses, ill-paid and ill-treated, were sometimes an
exception). Much of the lack of freedom in social choices is seen in the novel in the
treatment of good and bad marriages -- whether Darcy marrying down, Lydia almost ruining
the family by impropriety, the shame of having relatives "in trade",
etc.