Which sentence fails to use correct parallel structure?
a)the dentist told the classroom of kindergarteners that they each needed to floss, brush, and rinse daily

a. she is a young, beautiful woman who deeply cares about her husband.

is correct

i believe that the answer is true.

the grass-plot before the jail, in prison lane, on a certain summer morning, not less than two centuries ago, was occupied by a pretty large number of the inhabitants of boston; all with their eyes intently fastened on the iron-clamped oaken door.

— the scarlet letter,

nathaniel hawthorne

''eyes intently fastened''

''iron-clamped oaken door''

are the answers