B is the answer because there is no function of this part in human being

Understanding the Vermiform Appendix
The vermiform appendix, commonly referred to as the appendix, is often considered a vestigial organ in the human alimentary canal. Here’s a detailed explanation:
Definition of Vestigial Organs
- Vestigial organs are remnants of organs that had important functions in the evolutionary ancestors of a species but have lost or diminished their original function in the current organism.
Location and Structure
- The appendix is a small, tube-like structure attached to the large intestine, typically located in the lower right abdomen. It measures about 3 to 4 inches in length.
Evolutionary Perspective
- In herbivorous ancestors, the appendix was believed to help in digesting cellulose from plant material, acting as a fermentation chamber. Over time, as human diets evolved, the reliance on this organ diminished.
Current Understanding of Function
- While the appendix is often labeled as vestigial, some studies suggest it may play a role in the immune system:
- It contains lymphoid tissue that may help in the development of gut-associated lymphoid tissue.
- It might serve as a reservoir for beneficial gut bacteria, aiding in gut health after gastrointestinal illnesses.
Conclusion
- Despite its possible functions, the removal of the appendix (appendectomy) due to inflammation (appendicitis) does not typically result in significant health issues, reinforcing its classification as vestigial.
In summary, the vermiform appendix is a fascinating example of how human anatomy reflects evolutionary history, serving as a reminder of the complex relationship between structure and function in biological systems.