A. Testing triggers a failure that is caused by a defect in the software, whereas debugging is concerned with finding the causes of this failure (defects), analyzing these causes, and eliminating them.

B. Testing triggers a failure that is caused by a defect in the software, whereas debugging is concerned with finding the causes of this failure (defects), analyzing these causes, and reproducing them.

C. Testing identifies a defect that is caused by an error in the software, whereas debugging is concerned with finding the causes of this defect, analyzing these causes, and eliminating them.

D. Testing triggers a defect that is caused by an error in the software, whereas debugging is concerned with finding the causes of this defect, analyzing these causes, and eliminating them.