Question

what is most likely the reason why the author chooses to conclude the article with these paragraphs?
a to highlight how peoples lung function can vary
b to highlight how people can choose to breathe quickly or slowly
c to highlight how spirometers can help the lungs work better
d to highlight how a breath is one inspiration and one expiration

Explanation:

Without seeing the full - text and the concluding paragraphs, we can analyze the options based on general knowledge of respiratory system topics. Option A focuses on individual variation in lung function which could be a relevant conclusion in a text about respiration. Option B about the choice of breathing rate is a bit more narrow and might not be a typical conclusion. Option C about spirometers helping lungs work better seems off - topic as the text seems more about basic respiration than medical devices. Option D about the definition of a breath is rather basic and not likely a concluding point. Given the context of the respiratory system topics in the visible text, Option A is the most likely conclusion as it ties into the overall theme of lung function.

Answer:

A. to highlight how people's lung function can vary