**Core Concept**
Apoptosis, also known as programmed cell death, is a regulated process of cellular self-destruction essential for normal development, tissue homeostasis, and removal of damaged or unwanted cells. This process is characterized by distinct morphological and biochemical changes, including cell shrinkage, membrane blebbing, and DNA fragmentation.

**Why the Correct Answer is Right**
Apoptosis is mediated by a family of cysteine proteases known as caspases, which are activated in a cascade-like manner. The mitochondrial pathway of apoptosis involves the release of cytochrome c from the mitochondria, leading to the activation of caspase-9 and subsequent activation of downstream caspases. This process is regulated by pro-apoptotic and anti-apoptotic members of the Bcl-2 family, which control the release of cytochrome c.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the primary mechanism of apoptosis.
**Option B:** This option is incorrect as it does not acknowledge the central role of caspases in the apoptosis pathway.
**Option C:** This option is incorrect as it does not specify the involvement of the mitochondrial pathway in apoptosis.

**Clinical Pearl / High-Yield Fact**
It is essential to distinguish between apoptosis and necrosis, as the latter is a form of unprogrammed cell death often associated with tissue injury and inflammation. Apoptosis is characterized by the presence of apoptotic bodies, which are membrane-bound structures containing fragmented cellular components.

**Correct Answer: D.**