We move our hands while walking for
A) Faster movement
B) Balancing
C) Increasing blood circulation
D) Relieving tension

Hint: When walking, we move our hands as a normal action in which each arm swings opposite that of the leg with the step.

Complete answer:
First we should know about movement and locomotion to answer this question. Movement is when the living thing moves a portion of the body or parts to bring on the location of the species without a change. Locomotion is where the action of a portion of the body contributes to a change in the organism's position and location. All of things are brought in by the skeletal and muscular systems' combined efforts. In all vertebrates and invertebrates, movement can be seen.
Now, let us find the solution from the options-
Moving our hand during walking does not cause faster movement. Therefore, the option A is incorrect.
Moving arms in the opposite direction with regard to the lower limb decreases the body's angular momentum, helping to balance the rotational motion produced while walking.
Moving our hands while walking is a natural movement which does not play a role in increasing blood circulation. Therefore, the option C is incorrect.
Moving our hands while walking is a natural motion which does not help in relieving tension. Therefore, the option D is incorrect.
Therefore, while walking we move our hands for balance.

Thus, the correct answer is option (B) Balancing.

Note:Muscular motion is a movement caused by the musculoskeletal system. In higher vertebrates, this type of movement is observed. Three types of muscles are involved in such movement. Types of muscles are striated or skeletal muscles, striated or smooth muscles, cardiac muscles.