Which organ to pull air into the lungs by creating space and negative pressure in the lungs when it contracts?

the alveolus

the diaphragm

the bronchi

the glottis

Organ helps to pull air into the lungs by creating space and negative pressure in the lungs when it contracts is the diaphragm.

It's pretty clear from the option since only muscle can contract or pull things. From those 4 options, diaphragm is the only muscle. Diaphragm is muscle on the bottom of the lungs that will pull lungs. Another muscle that doing the similar thing is intercostal muscle.