The correct answer is c) muscular.
The muscular system is responsible for the movement of the body and its parts. It enables us to perform everyday activities like walking, running, and lifting objects. Additionally, the muscular system plays a crucial role in maintaining posture, ensuring that our bodies remain upright and aligned. Furthermore, when muscles contract, they generate heat, which is essential for maintaining body temperature.
In contrast, the skeletal system (option a) supports and protects the body’s organs and provides a framework for muscles to act upon, but it does not produce movement on its own. The lymphatic system (option b) is primarily involved in immune response and fluid balance, while the reproductive system (option d) is focused on reproduction and does not directly contribute to movement, posture, or heat production.