The reducing agent belongs in the left (oxidation) circle of the given Venn diagram. Therefore, option (1) is correct.
A substance that loses its electrons to other substances in a redox reaction and gets oxidized to a higher valence state is known as a reducing agent.
A reducing agent can be described as one of the reactants of an oxidation-reduction reaction that can reduce the other reactant by donating its electrons to the reactant.
If the reducing agent does not give away its electrons to other substances in a reaction, then the reduction cannot occur. For example, in the following chemical reaction;
[tex]H_2(g) + F_2(g) \longrightarrow 2HF(g)[/tex]
Hydrogen gas acts as a reducing agent because it gives out its electrons to fluorine, which permits fluorine to be reduced.
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