Explanation:

- Nervous System:

- It controls every activity in the body.

- Manages both voluntary actions like moving and involuntary actions like breathing.

- Includes the brain, spinal cord, and nerves.

- Correct Answer

- Respiratory System:

- Responsible for taking in oxygen and expelling carbon dioxide.

- Involves organs like the lungs and airways.

- Not primarily responsible for overall body control.

- Digestive System:

- Breaks down food into nutrients the body can use.

- Involves the stomach, intestines, and other organs.

- Not involved in direct control of bodily activities.

- Reproductive System:

- Responsible for reproduction and producing offspring.

- Involves organs such as ovaries and testes.

- Not related to controlling body activities.