Alveoli are most likely to collapse (resulting in atelectasis) when which condition exists

A complete or partial collapse of the region of the lung or the entire lung is known as atelectasis. It takes place when the alveoli present inside the lungs get filled with alveolar fluid or becomes deflated. It is one of the most general breathing issues post-surgery. However, the condition can also take place due to various other respiratory issues like lung tumors, cystic fibrosis, and fluid in the lung, chest injuries, and respiratory weakness.

the answer will be a) proteins i believe

nucleus

would be most reasonable answer tbh