Answer:
C. Athletic gear
Explanation:
Hereditary, or your genes, define what you look like based on your parents genes. They could also determine any conditions you might have taken from relatives, such as skin diseases and weight diseases, which would change your appearance.
Your diet defines a lot of how you appear. Depending on how much you eat, what you eat, and how often you eat will shape how you look. Though genes may effect how you process calories, people who eat more junk food are prone to gaining more weight than those who eat healthy food.
While athletic gear can help you stay safe, it does not affect your overall appearance. Gear does not change how much you weigh or what conditions you have, or your genes. Gear just makes sure you stay safe while exercising.
Exercise can change a lot of your appearance. Exercise can help you lose weight and gain muscle. For many it can also relieve symptoms of diseases, such as rehabilitation after breaking a bone.
So, the correct answer would be athletic gear.
Hope this helps!
Panna