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How is the heating of surface done in flame hardening technique?

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How is the heating of surface done in flame hardening technique?

(a) Oxy-acetylene torch

(b) Carburizing flame

(c) Electrode

(d) Direct sunlight

I have been asked this question during an internship interview.

I'm obligated to ask this question of Selective Hardening topic in chapter Heat Treatment of Engineering Material & Metallurgy

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Correct choice is (a) Oxy-acetylene torch

Explanation: Flame hardening is a selective hardening process with a combustible gas flame as the source of heat for austenizing. The surface to be hardened is heated to a temperature above its upper critical temperature. This is done using an oxy-acetylene torch.

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