Answer: D. Severe
Explanation: The person who answers 'yes' to the question definitely has severe food insecurity because, it is a period of 12 months and not eating for a whole day is not such a bad thing. Fast does help the body in tremendous ways like weight loss, improved blood sugar control and so on.
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).