**Core Concept**
Cruelty by husband or in-laws towards their wife is a form of domestic violence that can have severe physical and psychological consequences. This behavior can be considered a criminal offense under specific sections of the Indian Penal Code (IPC).

**Why the Correct Answer is Right**
Section 498 A IPC specifically deals with the punishment for the husband or his relatives for subjecting a married woman to cruelty. This includes physical or mental harassment, leading to the wife's suffering or abetting her suicide. The term "cruelty" encompasses a wide range of behaviors, such as physical abuse, verbal harassment, and emotional manipulation. The intention behind this section is to protect married women from domestic violence and ensure they receive justice when subjected to such treatment.

**Why Each Wrong Option is Incorrect**
**Option A:** Section 304 A IPC pertains to causing death by negligence, which is not directly related to cruelty by husband or in-laws. This section focuses on accidental or unintentional harm, rather than deliberate cruelty.
**Option B:** Section 304 B IPC deals with dowry death, which is a specific type of homicide committed by a husband or his relatives for or in connection with any demand for dowry. While related to dowry, it is not the primary section addressing cruelty.
**Option D:** Section 320 IPC defines grievous hurt, which includes various forms of physical injuries but does not address the issue of cruelty or domestic violence.

**Clinical Pearl / High-Yield Fact**
When evaluating cases of alleged cruelty, it is essential to consider the victim's testimony, medical evidence, and witness statements. A thorough investigation and documentation of the incident are crucial in establishing a case of cruelty under Section 498 A IPC.

**✓ Correct Answer: C. 498 A IPC**