To stress relieve a cold worked steel part, it is heated

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To stress relieve a cold worked steel part, it is heated to a temperature close to.... A... and grain obtained after cooling are... B.
A. lower critical temperature/upper critical temp
B. fine/coarser

1. A-upper critical temp B-coarser
2. A-lower critical temperature B-causer
3. A-upper critical temp B-fine
4. None of these

Correct Option: A

upper critical temp & causer grain structure.