**Core Concept**
The question pertains to the sentencing powers of a Chief Judicial Magistrate (CJM) in the Indian judicial system. The CJM is a judicial officer who presides over a court of first instance, with limited powers to sentence offenders.

**Why the Correct Answer is Right**
The CJM can sentence a guilty person to imprisonment for a period that is specifically defined by law. According to the Criminal Procedure Code (CrPC), 1973, a CJM can sentence an offender to imprisonment for a maximum period of three years. This power is granted to the CJM under Section 29 of the CrPC, 1973, which outlines the sentencing powers of magistrates.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not mentioned in the context of CJM's sentencing powers.
* **Option B:** This option is incorrect as the CJM's powers are limited to three years of imprisonment, not five years.
* **Option C:** This option is incorrect as the CJM's powers are limited to three years of imprisonment, not seven years.

**Clinical Pearl / High-Yield Fact**
The Indian judicial system has a hierarchical structure, with magistrates presiding over courts of first instance. The CJM has limited powers to sentence offenders, which are defined by law.

**Correct Answer: D. 3 years.**