I believe the answer is C because it has multiple answers in one, and the most effective early childhood curriculum can have more than one solution.
A food I often eat is eggs, and eating undercooked eggs have a high risk of having salmonella. This is why it is dangerous to eat raw cookie dough, even though I do it anyways. Salmonella is a gram negative bacterium, it is rod shaped and flagellated. Undercooking foods and leaving them in warm temperatures can cause the pathogens to grow. Habits you can practice to reduce the risk of foodbourne illness would be to always be sure your food is cooked all the way, not eat anything raw, do not leave meat out to where it gets to room temperature, and to not eat rotten meat, fruit, or vegetables.
