Five years ago, doctors employed at a hospital administered an X-ray treatment to patients. Very recently, medical science has discovered that the treatment has some side effects which are slow to develop. Several patients have now developed these side effects and have begun to suffer pain and discomfort.In an action in negligence by the patients against the hospital, which of the following best explains the likely outcome?
选项：

A:The hospital is liable because it is responsible for the actions of the doctors employed there.
B:The hospital is liable because the doctors employed there failed to take reasonable care in treating the patients.
C:The hospital is not liable because it is unlikely that the patients can establish that the doctors were in breach of duty.
D:The hospital is liable because the safety of the treatment was not such as the patients were entitled to expect.
E:The hospital is not liable because, by accepting the medical treatment, the patients consented to the associated risks.