Select the word which means the same as the group of words given "careful and thorough enquiry"?

Investigation

The word that means the same as "careful and thorough enquiry" is investigation. So the answer is > (☀) Investigation.

• Trial is a legal proceeding in which a person is accused of a crime and the evidence is presented to a judge or jury.
• Deriliction is the neglect of duty or responsibility.
• Examination is a formal assessment of a person's knowledge or skills.

An investigation is a systematic inquiry into a matter, typically by a public body or law enforcement agency. Investigations are often conducted to determine the facts of a crime, to identify a suspect, or to gather evidence. Investigations can be complex and time-consuming, but they are essential for ensuring that justice is served.