Katie worked for an advertising agency. Her job was to use the computer to enhance photos for magazine ads. She knew that she would always make the face of the model more attractive if she:

A) gave them blue eyes.
B) created at least one flaw on the face so the model wouldn't be perfect.
C) made the face more symmetrical.
D) added shadows.

Symmetry is widely regarded as a key aspect of physical attractiveness. Studies in psychology and evolutionary biology suggest that humans find symmetrical faces more attractive than asymmetrical ones, as symmetry is often interpreted as a sign of health and genetic fitness. Therefore, making a face more symmetrical is a common technique in photo enhancement to increase attractiveness.