It should be A because this system relies on antigens which are specific substance found in foreign microbes.
Answer:
Food safety
Explanation:
Checking what you eat so you don't get sick is important. I'd say the next important concern is nutritional labels if not food safety. I hope I helped! :D
Its better to use fresh ingredients because being able to get fresh ingredients that have not been in contact with pesticides and other artificial substances as well as avoiding processed foods, are excellent ways of eating healthier and improve your health.
