The tinned food that we bought in the way was all contaminated and spoiled.

Answer: Option A

Polluted : contaminated with harmful or poisonous substances.
Rotten : suffering from decay.
Adulterated : render (something) poorer in quality by adding another substance.
Noxious : harmful, poisonous, or very unpleasant.
Contaminated : make (something) impure by exposure to or addition of a poisonous or polluting substance.

Synonym of Contaminated is Polluted