What is the scope of activity allowed for a person holding a Cosmetologist license?

The correct choice highlights that a licensed Cosmetologist in Pennsylvania is authorized to perform a wide range of services related to hair, skin, and nails. This encompasses not just hair cutting and styling, but also treatments and services that involve skin care and manicuring. The comprehensive training and education a Cosmetologist undergoes equip them with the skills necessary to provide these diverse services, which is why holding a Cosmetologist license allows for the performance of all services associated with that profession.

The other choices limit the scope of practice to specific areas, which does not reflect the full range of skills and services a Cosmetologist is licensed to provide. This broader capability is an essential aspect of a Cosmetologist's role in the beauty industry, underscoring the importance of versatility and comprehensive knowledge in their practice.