Steel is heated to below red heat and then, cooled slowly. The process refers to:

hardening

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annealing

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tempering

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nitriding

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Solution

The correct option is C annealing
When a substance is heated to high temperature and slowly cooled down to room temperature, it is called annealing of the substance.
Tempering is a low temperature (150ºC to 650ºC) heat treatment intended to remove the stresses and brittleness caused by quenching.

Suggest Corrections

(p) Nitriding	(I) Process of heating steel to redness and then cooling it very slowly
(Q)Annealing	(II) Process of heating steel in presence of $N H_{3}$ and producing hard coating of Iron Oxide on the surface of steel
(R) Tempering	(II) Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil.
(S) Quenching	(IV) Process of heating quenched steel to a temperature well below redness and then cooling it slowly