What is the total square footage of skin that an average adult has?

The average adult has approximately 22 square feet of skin, making this the correct choice. This figure is derived from anatomical studies and estimates that consider various factors, including body size and composition. Skin is the largest organ of the body, serving a vital role in protection, regulation, and sensation. Understanding the total square footage of skin can be important in fields such as esthetics, where treatments and products are often applied based on the area of skin being treated. The other options provide different square footage estimates but do not align with the widely accepted figure of 22 square feet for an average adult.