It Is Now Past the Normal Dinner Time,but You Do

It is now past the normal dinner time,but you do not even want to think about food.Only diarrhea,abdominal cramps,and vomiting are on your mind.This all started a couple of hours ago in the early evening,after having a ham sandwich for lunch bought at a kiosk out on the street.Since you have had microbiology,you surmise that it is a Staphylococcus aureus-related disorder.Why do you think this?

A) The toxin produced by Staphylococcus aureus was already in the ham,so the symptoms can occur quickly.
B) Ham is notorious for being contaminated with Staphylococcus aureus bacteria.
C) Only Staphylococcus aureus infection causes vomiting,along with cramps and diarrhea.
D) Staphylococcus aureus in the most common cause of gastrointestinal disease.