A factory manufacturing illicit liquor was unearthed by the police yesterday.

Answer: Option B

Poisonous : (of a substance or plant) causing or capable of causing death or illness if taken into the body.
Unlawful : not conforming to, permitted by, or recognized by law or rules.
Intoxicating : (of alcoholic drink or a drug) liable to cause someone to lose control of their faculties or behaviour.
Cheap : low in price, especially in relation to similar items or services.
Illicit : forbidden by law, rules, or custom.

Synonym of Illicit is Unlawful