A. Doctors think of other consequences of the treatment they provide to the patients.
B. All the hospitals have X-ray machines.
C. here are no government directives regarding the manufacture of X-ray machines.
D. None of These
Feedback rom the passage it is clear that the doctors do not think of using the X-ray machines. Hence, (A) cannot be concluded. The context of the passage is not about the number of hospitals that use X-ray machines. Similarly, (C) is also out of context. The passage is not referring to availability of alternatives to X-rays or otherwise. Hence, (B) cannot be concluded.