Which of the following factors can contribute to increased hair growth?

Increased hair growth can be influenced by several factors, and each of the listed options plays a role in this phenomenon. When considering the correct answer, it's essential to recognize how each factor contributes.

Sun exposure can lead to increased circulation and stimulation of the hair follicles in the areas that are exposed, potentially resulting in the acceleration of hair growth. The interaction of UV rays can affect scalp and skin health, promoting hair growth in some individuals.

Stress, while often associated with hair loss, can also lead to fluctuations in hormone levels that may paradoxically stimulate hair growth in different areas of the body. Increased levels of certain hormones during stressful periods can activate hair follicles and promote growth.

Tweezing, while a method of hair removal, can sometimes cause the hair follicles to react by producing hair more aggressively during the regrowth cycle. The act of plucking hairs may stimulate the surrounding follicles and lead to increased hair density or coarseness over time.

Therefore, the inclusion of all these factors as contributors to increased hair growth encapsulates the varied influences on hair dynamics in the human body.