Discussion
Assertion (A): An internal flaw and a surface flaw at a fracture origin implicate different parts of the process.
Reason (R): An internal flaw must have been present before firing, whereas a surface flaw may be introduced later.
Answer: B
Both are true and the reason gives the logic of the investigation: the position of the origin narrows the search considerably, which is why fractography is done before anything else is changed. Guessing at the cause without it wastes a great deal of effort.
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