The correct option is C Contaminated
Option C)contaminated to is correct as it means having been made impure by exposure to or addition of a poisonous or polluting substance and best suits the given sentence. The other options are wrong as perfect, healthy, and hard mean having all the required or desirable elements, qualities, or characteristics; as good as it is possible to be, in a good physical or mental condition; in good health, and solid, firm, and rigid; not easily broken, bent, or pierced respectively. The correct answer is C)contaminated.