The human body`s main organ of balance is located in the inner part of the ear. This organ is called the vestibular system, which is responsible for maintaining the body`s balance and orientation in space.

Option 1, the inner part of the ear, is the correct answer. The inner ear consists of the cochlea, which is involved in hearing, and the vestibular system, which is responsible for balance. Within the vestibular system, there are three semicircular canals and two otolith organs- the utricle and the saccule. These structures contain tiny hair cells and fluid-filled spaces that detect movement and changes in position, allowing the brain to interpret and maintain balance.

Option 2, the middle part of the ear, is incorrect. The middle ear contains the ear drum and three small bones called ossicles, which transmit sound vibrations from the outer ear to the inner ear. It is not directly involved in the body`s balance.

Option 3, the front part of the brain, is incorrect. While the brain plays a role in processing information from the vestibular system to maintain balance, it is not the organ responsible for balance itself.

Option 4, the top part of the vertebral column, is also incorrect. The verte