Discussion
Assertion (A): Register allocators weight uses inside loops more heavily than uses outside them.
Reason (R): An instruction inside a loop executes many times, so keeping its operands in registers saves proportionately more.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A use inside a loop costs whatever it costs multiplied by the trip count, so the allocator weights it accordingly - commonly by ten per level of nesting. That weighting is what makes the allocator spill the outer values and keep the inner ones.
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