When a person goes hungry for a long period of time they can:

The correct option is All of the above.

When a person undergoes prolonged hunger or chronic starvation, their body experiences a severe lack of essential nutrients, vitamins, minerals, and energy. This deprivation affects multiple organ systems and biological functions in the following ways:
1. Affects brain functioning: The brain is a highly metabolic organ that relies heavily on a continuous supply of glucose. During long periods of hunger, the lack of glucose and key nutrients compromises cognitive functions, leading to poor concentration, memory impairment, confusion, and mood disturbances.
2. Be more prone to disease: Nutritional deficiency impairs the immune system. Without adequate proteins, vitamins (such as Vitamin A, C, and E), and minerals (like zinc and iron), the body cannot produce sufficient white blood cells and antibodies to fight off pathogens, making the individual highly vulnerable to infections.
3. Be stunted in height: Chronic malnutrition, especially in children and adolescents, severely restricts physical growth. The body prioritizes surviving on minimal energy rather than skeletal development, which results in stunted height and delayed developmental milestones.

Since all of these physiological consequences occur as a result of long-term hunger, all the given statements are correct.