You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Increased airway resistance is/are caused bya)  Forced expirationb) Denser airc)  Low lung volumed) High lung volue and explain in detail?
There is dynamic compression of the small airways during forceful expiration, resulting in increased airway resistance. When the air is denser, the airway resistance is more. Less volume of the lung also increases the airway resistance.