Which of the following is a common symptom of foodborne illness?

Foodborne illnesses can manifest through a variety of symptoms, and all the options listed are indeed common indicators of such illnesses. Vomiting occurs as the body attempts to expel harmful pathogens or toxins from the stomach. Diarrhea is another frequent response, as it helps to eliminate pathogens from the intestines and can lead to dehydration if not monitored. Fever often accompanies foodborne illnesses as the immune system reacts to fight off infection.

Since all three symptoms may occur either alone or in combination during a foodborne illness, selecting the option that includes all of them accurately reflects the spectrum of symptoms that can arise. Therefore, the correct answer acknowledges that the presence of vomiting, diarrhea, and fever are all common reactions to foodborne pathogens, making 'All of these' the most comprehensive choice.