The various activities of the nervous system include a function such as -

A. Integrative
B. Motor
C. Sensory
D. All of the above

To determine which answer is correct, we can break down the question and explore each option.

A. Integrative: The nervous system plays a crucial role in integrating information from different parts of the body and forming a coordinated response. This includes processing sensory input and coordinating motor output. This function involves the brain and some parts of the spinal cord. So, we can consider this as one function of the nervous system.

B. Motor: The nervous system controls muscle movements and allows us to perform various actions. This function includes both voluntary movements, such as walking or grasping objects, and involuntary movements, such as those involved in basic bodily functions like breathing or digestion. So, motor function is another function of the nervous system.

C. Sensory: The nervous system receives and processes sensory information from the environment or within the body. This information could be related to touch, pain, temperature, sound, light, or various other stimuli. The sensory function involves the sense organs, such as eyes, ears, skin, etc., and the nervous pathways that transmit sensory signals to the brain. So, sensory function is also a function of the nervous system.

Based on the explanations above, it is evident that all of the options (A. Integrative, B. Motor, C. Sensory) are correct. Therefore, the correct answer is D. All of the above.