“Brittle fracture generally occurs at low temperatures, specifically below the ductile-to-brittle transition temperature as defined by the Charpy impact test.”
“Most carbon and low-alloy steels are ductile above their Charpy transition temperature but may fracture suddenly without ductility below it.”
(Reference: API RP 571, Section 4.2.1.2 – Brittle Fracture)
Hence, option C is correct and technically accurate based on the material behavior curve.
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