IMO C
ensures is || to needs and , saving is modifying the whole clause.
With the readily available home sleep apnea test kit in the market, more people are now willing to take the test that ensures an easy to conduct diagnosis in the comforts of home, needing patients to pay far less, and saves a huge cost for the same test in a medical facility.
a) that
ensures an easy to conduct diagnosis in the comforts of home,
needing patients to pay far less, and
saves --> ensures is not || to needing
b) that
ensures an easy to conduct diagnosis in the comforts of home,
needing patients to pay far less, and
saving ---> ensures is not || to needing
c) that
ensures an easy to conduct diagnosis in the comforts of home and
needs patients to pay far less,
saving --> --> ensures is || to needs
d)
ensuring an easy to conduct diagnosis in the comforts of home and
needing patients to pay far less and are
saving --> wrong meaning.
e)
ensuring an easy to conduct diagnosis in the comforts of home,
needing patients to pay far less and thus
save -> wrong meaning.