Which of the following skin types is likely to tan more effectively?

Type III, which represents a medium skin tone, is most likely to tan more effectively compared to the other skin types listed. This is because individuals with medium skin have a higher amount of melanin, the pigment responsible for skin color, which allows for better absorption of UV rays. This increased melanin provides a natural protective barrier against sunburn while still enabling the skin to darken and acquire a tan with suitable UV exposure.

People with Type I and Type II skin tend to burn more easily due to their lower melanin levels, making them less effective at tanning. Type I is characterized by very fair skin that often burns with minimal sun exposure, while Type II is fair skin that also burns easily but may tan slightly with considerable sun exposure. Type IV, which has a moderate brown skin tone, typically tans well, but the most effective tanning typically occurs with Type III skin, as it has the balance needed for a more noticeable and effective tan while minimizing the risk of burning.