Solution

Non-cognizable offenses are minor offenses where the police cannot arrest anyone without a warrant. In such cases, if a person informs a police officer about the commission of a non-cognizable offense, the police officer is bound to: (A) Only enter the information in his diary - This option is incorrect. Merely recording the information in the diary is not sufficient in non-cognizable offenses. (B) Only refer the informant to the Magistrate - This option is also incorrect. The police officer cannot simply refer the informant to the Magistrate without taking any action. (C) Arrest the accused - This option is incorrect as non-cognizable offenses do not allow for arrest without a warrant. (D) Enter the information in his diary and refer the informant to the Magistrate - This option is correct. The police officer must enter the information in his diary and then refer the informant to the Magistrate. The informant may then file a complaint before the Magistrate, who will take further action.