How are the details of both Roderick's and Madeline's
illnesses important to the development of the plot?
A Their sicknesses reflect the decay of the estate and
their familial line.
B Madeline is near death, while Roderick's sensitivity
(or possible hypochondria) prevents him from leaving
the house, ensuring the end of their line.
Madeline's cataleptic condition leads to her early
burial, while Roderick's heightened senses forces him
to hear her struggle to break out of the tomb, driving
him mad.
D Madeline's weakened condition permits Roderick to
take advantage and kill her off, symbolically killing his
own illness/self, but his heightened senses send him
into madness over his guilt.

Answer is B) Madeline is near death, while Roderick's sensitivity (or possible hypochondria) prevents him from leaving the house, ensuring the end of their line.

Refer below.

Explanation:

Therefore,

Details of both Roderick's and Madeline's illnesses important to the development of the plot Madeline is near death, while Roderick's sensitivity (or possible hypochondria) prevents him from leaving the house, ensuring the end of their line.

Madeline is near death, while Roderick's sensitivity (or possible hypochondria) prevents him from leaving the house, ensuring the end of their line.

Explanation:

So it affect the plot maybe making the plot unfinished or not being able to pay the workers so it's important to the development of the plot.