Substances which prevent oxidation are known as:

Antioxidants

The correct answer is option 3. Antioxidants.

The substances that prevent oxidation are known as antioxidants. Antioxidants are molecules that inhibit or slow down the oxidation of other molecules. They achieve this by neutralizing free radicals, which are highly reactive molecules that can cause damage to cells and tissues through oxidative stress. By scavenging free radicals and preventing their harmful effects, antioxidants help protect cells and tissues from damage and reduce the risk of various diseases, including cancer, cardiovascular diseases, and aging-related conditions.

So, the correct answer is: Antioxidants