Discussion
Assertion (A): A simple code generator stores live values to memory at the end of each basic block.
Reason (R): Control may enter the next block from a different predecessor, so no assumption about register contents survives the boundary.
Answer: D
Both are true and the reason gives the mechanism, and it also explains why global allocation does better. An allocator working over the whole flow graph can keep a value in a register across blocks and avoid the traffic entirely.
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