**Core Concept**
The Golgi apparatus is a complex organelle found in eukaryotic cells, responsible for processing and modifying proteins and lipids synthesized by the endoplasmic reticulum. It plays a crucial role in protein synthesis, modification, and transport.

**Why the Correct Answer is Right**
The Golgi apparatus consists of a stack of flattened membrane-bound sacs, known as cisternae, which are responsible for the modification and packaging of proteins and lipids. The Golgi apparatus receives vesicles from the endoplasmic reticulum, which are then processed through a series of enzymatic reactions, including glycosylation, phosphorylation, and proteolytic cleavage. The modified molecules are then packaged into vesicles and transported to their final destination, such as lysosomes, the plasma membrane, or other parts of the cell.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the Golgi apparatus is not primarily involved in protein degradation, which is the function of lysosomes.
* **Option B:** This option is incorrect because the Golgi apparatus is not responsible for synthesizing ATP, which is the function of mitochondria.
* **Option C:** This option is incorrect because the Golgi apparatus is not directly involved in the synthesis of DNA, which is the function of the nucleus.

**Clinical Pearl / High-Yield Fact**
The Golgi apparatus is often referred to as the "post office" of the cell, as it receives, processes, and packages proteins and lipids for transport to their final destination.

**Correct Answer: C. It modifies and packages proteins and lipids received from the endoplasmic reticulum.**