The correct answer is (c).
A police diary is a record of all the activities of a police station. It is a chronological record of all the information received by the police station, all the reports lodged, all the investigations conducted, and all the arrests made. The police diary is a very important document, as it is used to track the progress of investigations and to provide evidence in court.
(a) Proceeding in investigation under Sec 172 is not the meaning of Police Diary under CrPC. Section 172 of the Code of Criminal Procedure deals with the power of the police to investigate cognizable offences. It does not deal with the police diary.
(b) Information recorded under Sec 168 is not the meaning of Police Diary under CrPC. Section 168 of the Code of Criminal Procedure deals with the power of the police to record information relating to cognizable offences. It does not deal with the police diary.
(d) Statement recorded under Sec 161 is not the meaning of Police Diary under CrPC. Section 161 of the Code of Criminal Procedure deals with the power of the police to record statements of witnesses. It does not deal with the police diary.