**Core Concept**
Apoptosis is a form of programmed cell death that plays a crucial role in maintaining tissue homeostasis and eliminating damaged or unwanted cells. Cytochrome C is a key player in the intrinsic mitochondrial pathway of apoptosis, where it triggers a series of downstream events leading to cell death.

**Why the Correct Answer is Right**
Cytochrome C acts through the formation of the apoptosome complex, which is a multimeric protein complex that activates the caspase cascade. Upon release from the mitochondria, cytochrome C binds to Apaf-1 (apoptotic protease activating factor-1) and triggers the recruitment of pro-caspase-9, leading to the formation of the apoptosome complex. This complex then activates caspase-9, which in turn activates downstream caspases, such as caspase-3 and caspase-7, resulting in the execution of cell death.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as cytochrome C does not act through the PI3K/AKT pathway, which is involved in cell survival and anti-apoptotic signaling.
* **Option B:** This option is incorrect as cytochrome C does not act through the MAPK/ERK pathway, which is involved in cell proliferation and differentiation.
* **Option C:** This option is incorrect as cytochrome C does not act through the NF-κB pathway, which is involved in inflammation and immune response.

**Clinical Pearl / High-Yield Fact**
The release of cytochrome C from the mitochondria is a critical event in the intrinsic mitochondrial pathway of apoptosis, and its inhibition can prevent cell death. This makes cytochrome C a potential target for anti-cancer therapies.

**Correct Answer: C. The apoptosome complex.**