If a person in the simulation never eats or drinks anything from the buffet table, is it possible for them to become sick with the foodborne disease

No, Because they did not come in contact with the infected food.
The only way for someone to become sick with the foodborne disease if they are directly consuming the food into their body.
The bacteria that contaminate a food cannot transfer through breathing air like what common virus usually can do.

B. it promoted the powers of the executive branch