Hint: We know that allotrope can be defined as the one or more physical forms of a chemical element that occurs in the same physical state. Allotropes may have differences in their chemical and physical characteristics.
Complete answer: Tin is a chemical substance represented by $ Sn $ having atomic number $ 50. $ It is silvery metal but soft enough to cut with a knife. It is soft, malleable, ductile and highly crystalline silvery white metal. Allotropes are various structural types of the same element so we can say that they show different physical and chemical properties. The allotropic forms change due to the same forces that influence other structures such as light, pressure and temperature. So the stability of the different allotropes depends on the specific conditions. The plague of tin is the conversion of white tin to grey tin. It's an autocatalytic, allotropic transformation of the element tin, which causes deterioration of tin objects at low temperatures. Tin pest is an autocatalytic, allotropic transformation of the element tin, which causes deterioration of tin objects at low temperatures. · Therefore, the correct answer is option B.
Note: Remember that it shows no metallic properties because its atoms form a covalent structure due to which electrons cannot move freely. It exists in the metallic form and known by the name white tin have BCT type structure and are stable at or above room temperature. It is malleable in nature.