Which statement correctly describes restrictive lung disorders?

Restrictive lung disorders are characterized by a decrease in the total volume of air that can be inhaled into the lungs, making it difficult for individuals to take full breaths. This restriction is often due to stiff or inflamed lung tissue, which can result from conditions such as pulmonary fibrosis or other diseases that affect the lung’s ability to expand.

The statement that restrictive lung disorders restrict the volume of air that can be inhaled accurately captures the essence of these disorders. Additionally, while restrictive lung disorders do involve conditions that produce pulmonary fibrosis, saying that they allow for unlimited air inflation in the lungs is inaccurate. Thus, the assertion that both statements about air inflation and pulmonary fibrosis are true is misleading.

Consequently, the correct answer highlights the fundamental aspect of restrictive lung disorders, which involves limitations on the amount of air inhaled, thus making option C the most precise definition of what a restrictive lung disorder entails.