Hunger can be defined as a physiological drive to find and eat food a sensation caused by distension of the stomach and small intestine starvation a psychological drive to eat

The correct answer is "a physiological drive to find and eat food." "Physiological" refers to the everyday functions that living organisms perform. Hunger falls under the category of physiological, because it is a feeling that makes an organism want to eat (which is a normal, everyday function). An "appetite" (not hunger), is psychological, which means an organism eats because it's surrounded by good food, or because it's sad, for example.