Explanation:

- Section 167 of the Code of Criminal Procedure (CrPC) deals with detention during investigation.

- It specifies different detention periods based on the severity of the alleged offence.

- For serious offences (punishable with death, imprisonment for life, or imprisonment for a period of not less than 10 years), the detention can be authorized up to 90 days.

- For less serious offences (those not covered by the above category), the detention period can be authorized up to 60 days.

- After the specified period, if the investigation isn't completed, the accused has the right to be released on bail.

- Correct Answer: Option 3 - 60 days.