Answer:
d. All of these are correct\
Explanation:
a. One positive screening test is not usually sufficient to diagnose a disease
A single test is not enough to diagnose a disease because they can have several factors that affect the result either in the taking of the exam or that is a result that you will need to do if you want to do other tests to confirm what type of illness you have.
b. Changes within the range of normal can be due to a disease
This result may be the indication of a disease since it is not within the normal range.
c. The range of normal is not the same for all groups or populations
Depending on the test, the ranges vary, often according to age or sex.
