He was ingenious enough to know how to get out of the clutches of law.

Answer: Option A

Clever : quick to understand, learn, and devise or apply ideas; intelligent.
Intelligent : having or showing intelligence, especially of a high level.
Alert : quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant.
Cunning : having or showing skill in achieving one's ends by deceit or evasion.
Ingenious : (of a person) clever, original, and inventive.

Synonym of Ingenious is Clever