Final answer:
Skin type cannot be permanently changed with treatments because it is genetically determined, affected by environmental factors, and subject to change with age.
Step-by-step explanation:
The correct answer is 4) All of the above.
Skin type cannot be permanently changed with treatments because it is genetically determined, meaning that the genes we inherit from our parents play a major role in determining our skin type. Additionally, skin type is affected by environmental factors such as sun exposure, which can cause changes in the skin's appearance. Finally, skin type is subject to change with age as our skin goes through natural aging processes.