Explanation:

Standing is a basic human posture in which a person is upright, supported by their feet and not moving. It is a common position for various activities such as waiting, observing, or even working. When people stand, they are not dancing or sleeping, but simply maintaining an upright position on their feet.

Standing vs Dancing:
- Dancing involves rhythmic movements of the body in response to music or a specific beat. It often includes coordinated steps, gestures, and sometimes even jumps or spins.
- On the other hand, standing does not involve any specific movements or actions. It is a static position where a person remains in one place without any particular rhythmic pattern.

Standing vs Walking:
- Walking is a form of locomotion where a person moves by alternately putting one foot in front of the other, shifting their weight from one leg to another.
- In contrast, standing refers to the act of being stationary on both feet without any forward or backward motion.

Why the Correct Answer is 'B' (Walking):
- The correct answer is option 'B' (Walking) because standing is simply maintaining an upright position on one's feet and not engaging in any specific movement or action.
- Walking involves stepping forward with one foot while the other is in contact with the ground. It is an active motion of moving from one place to another by repeatedly placing one foot in front of the other.
- Standing, however, does not involve any movement of the feet or body. It is a relatively stable position where a person supports their body weight on their feet without any forward or backward motion.

Therefore, when people stand, they are not dancing or sleeping, but rather maintaining an upright position without any specific movement. The correct answer is 'B' (Walking).