Answer is:Ā D. Tin atoms give electrons to lead(II) ions and are oxidized to tin(II) ions.
Chemical reaction: Snā°Ā + Pb²āŗĀ ā Sn²⺠+ Pb.
Tin atom (oxidation number 0)Ā give two electrons to led ions, oxidation number of tin is greater now (oxidation number +2).
Oxidation is loss of electrons.