**Core Concept**
Apoptosis is a highly regulated process of programmed cell death, essential for maintaining tissue homeostasis and eliminating damaged or unwanted cells. It involves a series of cellular changes, including DNA fragmentation, membrane blebbing, and phagocytosis of the apoptotic cell.

**Why the Correct Answer is Right**
The correct answer involves understanding the key characteristics of apoptosis. Apoptosis is a vital process that allows for the elimination of damaged or unwanted cells, thereby maintaining tissue homeostasis. This process is characterized by distinct morphological changes, including cell shrinkage, chromatin condensation, and membrane blebbing. Additionally, apoptosis involves the activation of specific caspases, such as caspase-3 and caspase-9, which play crucial roles in executing the cell death program.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not a characteristic of apoptosis. Apoptosis is a highly regulated process, and its dysregulation can lead to various diseases, including cancer. However, it is not directly related to cell fusion.
**Option B:** Incorrect because it is a characteristic of necrosis, not apoptosis. Necrosis is a form of accidental cell death, often resulting from ischemia or trauma.
**Option C:** Incorrect because it is not a hallmark of apoptosis. Apoptosis is characterized by the activation of specific caspases and the presence of apoptotic bodies, not the release of lysosomal enzymes.

**Clinical Pearl / High-Yield Fact**
It is essential to distinguish between apoptosis and necrosis, as their dysregulation can lead to different disease states. Apoptosis is often associated with cancer, while necrosis is linked to ischemic injuries.

**Correct Answer:** D.