Why is the tracheal wall supported by rings of cartilage? to allow for the exchange of gases in the lungs
to trap remaining particles that have slipped through the upper respiratory tract
O to stop foreign objects from entering the airways
to prevent the airway from collapsing while air flows through it

Tracheal wall is supported by rings of cartilage to prevent the airway from collapsing while air flows through it.

Explanation:

The trachea is a structure that forms part of the respiratory system, between the larynx and the main bronchi, allowing air to pass into the lungs.

Structure of the trachea is formed by a series of incomplete cartilaginous rings that prevent the collapse of this structure during respiratory activity.  The catílage is a firm and at the same time flexible tissue, which allows in the trachea the expansibility but avoids the closing of this important airway.

The other options are not correct because:

answer; /// the correct answer to the above question is a hospital is responsible for all area (250 feet) around the main building and around areas where inpatient services are provided

i don't think so because different teachers have different materials. tehy teach differently, unless you know for sure your teacher is the exact same as others. i would just contact ur teacher