Answer:
C) help readers understand how to select the right breed.
Step-by-step explanation:
The passage deals with helping readers to carefully choose the best or most suitable dog breed according to the owners' lifestyles and ambitions, such as companionship, security, exercise, space and time.
The rest of the alternatives are incorrect because the text does not encourage training, it does not describe people and it does not urge people to adopt dogs from animal shelters.