Write the next sentence in the following story.

How to dispute a hospital bill
Hold onto all of your bills.
Effectively disputing a hospital bill requires that you know exactly what you are being charged for. Preserve every bill that you receive from the hospital.

Select from the following.
(a). You should ask doctors and nurses for copies of any receipts or bills. In particular, keep receipts from canceled checks, broken checks, and so on.;
(b). Gather any receipts or documentation you have of the bill and sign them. You should also get signatures from anyone who has worked with the hospital or did work at or treated the hospital.;
(c). This way, if the hospital doesn't give you the bill, you can find it and cancel the agreement. By doing this, you will be able to negotiate a settlement that is satisfactory to both sides.;
(d). Also hang onto bills from medical centers, labs, and the doctor's office. When a hospital bills for medical care, the bills are often incredibly vague and wordy.;. The answer should be
(d).