The correct answer is A. Control time food/ingredients are exposed to ambient temperature and keep food out of the "Food Danger Zone" and always wash your hands.

Reference:

The FDA reports more than 40 kinds of bacteria that can occur in food and cause illness. The Big Six, dubbed because they are highly contagious and can cause severe illness include:

1. Shigella - often transferred from flies
2. Salmonella Typhi - Lives only in humans, transferred from person to person
3. Notyphoidal Salmonella - lives in animals, transferred from poultry, eggs, meat, dairy products, and produce
4. Shiga toxin-producing Escherichia coli (E. Coli) - found in ground beef and contaminated produce
5. Hepatitis A
6. Norovirus

There are others that are harmful and can even cause death.

https://resources.centralrestaurant.com/cross-contamination-food-safety-101/