Answer: A) dehydration
Explanation: Dehydration is severe health situation in which the lack of fluid is faced by human body due to fluids e.g- water goes out of body quickly after consumption.Body has low fluid level which induces weakness in body while doing normal body functions.
The skin becomes dry due to dehydrated body, eyes become shrunken, feeling of dizziness, low energy, decrease in urination level etc are the indication of dehydration.
Other options are incorrect because food poisoning induces stomach ache,diarrhea due to contaminated and stale food. Heat stroke and sun burn are caused due to long exposure of heat and sun that results in sickness , headache , dizziness and burnt skin, redness ,rashes etc respectively.
Thus, the correct option is option(A).