Your Roommate Made Potato Salad and Then Let It Sit

Your roommate made potato salad and then let it sit on the counter overnight,forgetting to refrigerate it.When she discovered it in the morning,she asked you whether you thought it would be safe to eat.How should you reply?

A) Yes,as long as she refrigerates it now,since the cold will kill the microorganisms.
B) Yes,as long as she refrigerates it now,since the cold will slow the growth of any contaminating microorganisms.
C) No,because refrigeration will not inactivate microbial toxins that may have been produced while the salad sat at room temperature.
D) Yes,as long as she refrigerates it now,because any toxins produced will be destroyed by refrigeration.
E) Yes,as long as she refrigerates it now,since the cold will stop microbial growth and inactivate toxins.