Which of the following is considered a physical need?

The need for water is classified as a physical need because it is essential for basic survival and maintaining physiological functions in the body. Water plays a critical role in hydration, digestion, temperature regulation, and nutrient transportation. Without adequate water intake, individuals can experience severe health issues, including dehydration, which can lead to organ failure and other life-threatening conditions.

In contrast, the other options fall under different categories of needs. The need for companionship addresses emotional and social aspects of human experience, highlighting the importance of relationships and social interactions. Privacy is also related to emotional and psychological well-being, ensuring individuals have personal space and autonomy. Lastly, the need for security pertains to safety and stability in one's environment, which is crucial for mental peace but does not directly relate to the physical requirements necessary for sustaining life.