Option 1: Ignorance -> means lack of knowledge or awareness, which is opposite to scrutiny.
Option 2: Objectivity -> refers to being impartial or unbiased, not related to close examination.
Option 3: Oversight -> can mean supervision or an unintentional omission, not a direct synonym for scrutiny.
Option 4: Examination -> means careful inspection or detailed observation, which directly matches the meaning of scrutiny.
Hence, Option 4: Examination -> Scrutiny means close and critical observation or examination of something, making "examination" the most accurate synonym among the given options -> correct