Well i am not 100 percent sure but i think the answer is D.
lethal dosage of chocolate for a human being is about 22lb (or 40 bars of Dairy Milk).
Malnutrition is not having enough of the needed nutrients (not having a good diet, eating a lot of unhealthy food but still eating) this could be from either under consumption or over consumption. While under-nutrition is when someone eats an inadequate amount of food for an extended period of time (not eating enough food in general).