close to prevent further damage. stop producing mucus. become clogged. become efficient.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The cilia in the respiratory system are responsible for preventing dirt and mucus from entering the bronchial tubes and lungs. If the cilia are damaged, the person's bronchial tubes and lungs are most likely to
Possibilities:
- close to prevent further damage.
- stop producing mucus.
- become clogged.
- become efficient.

become clogged.