40. What can be inferred from the passage?
(A) CancerSEEK is less able to detect cancer once it spreads to other parts of the body.
(B) CancerSEEK has a higher accuracy rate in detecting cancer at the second or third stage.
(C) CancerSEEK can detect cancer from blood samples without examination under a microscope.
(D) Before CancerSEEK was developed, no study had looked into RNA or DNA for cancer detection.