Final Answer:
Thus,the correct answer is C. Chest.

Explanation:
Waxing requires more strips in areas with higher hair density, and the chest typically has a higher hair density compared to other options. The number of hair follicles in a given area determines the hair density, and the chest tends to have a greater concentration of hair follicles than the legs, arms, or back.

In the chest region, the hair follicles are closely packed, resulting in a larger number of hairs per square inch. This necessitates the use of more wax strips to effectively remove hair from the entire chest area. The arms and legs have lower hair density compared to the chest, making them less likely to require as many wax strips. Similarly, the back, while larger in surface area, often has a lower hair density than the chest.

When considering waxing efficiency, it's crucial to factor in the distribution and density of hair follicles across different body parts. The chest, with its concentrated follicles, demands a greater number of wax strips to achieve thorough hair removal. This understanding helps estheticians and individuals seeking waxing services to optimize their resources and ensure a more effective and satisfactory hair removal experience.