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.