**Core Concept**
The 'C' wave in the jugular venous pulse (JVP) is a physiological phenomenon that occurs during the cardiac cycle. It is an important component of the JVP waveform, reflecting changes in intrathoracic pressure and right atrial pressure.

**Why the Correct Answer is Right**
The 'C' wave is generated by the bulging of the tricuspid valve into the right atrium during early diastole, as the right ventricle contracts and increases pressure in the right ventricle. This causes a transient increase in right atrial pressure, resulting in the 'C' wave. The 'C' wave is seen as a small positive deflection in the JVP waveform.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect, as it does not accurately describe the mechanism of the 'C' wave.
**Option B:** Incorrect, as it is not directly related to the generation of the 'C' wave.
**Option C:** Incorrect, as it is not a correct description of the 'C' wave.

**Clinical Pearl / High-Yield Fact**
The 'C' wave is an important marker of right ventricular function and can be used to assess the presence of tricuspid regurgitation or right ventricular failure.

**Correct Answer:**
The 'C' wave in JVP is due to the bulging of the tricuspid valve into the right atrium during right ventricular contraction.