Answer: Option A
Knowledge : facts, information, and skills acquired through experience or education; the theoretical or practical understanding of a subject.
Trial : a formal examination of evidence by a judge, typically before a jury, in order to decide guilt in a case of criminal or civil proceedings.
Witness : a person who sees an event, typically a crime or accident, take place.
Ignorance : lack of knowledge or information.
Ken : one's range of knowledge or understanding.
Synonym of Ken is Knowledge