Final answer:
Walking has been shown to be beneficial to a person's cardiovascular health, which is why living in the city can provide for a healthier lifestyle than living in the suburbs.
Step-by-step explanation:
The proposition that most helps to justify the reasoning that living in the city provides for a healthier lifestyle than living in the suburbs is option C) Walking has been shown to be beneficial to a person's cardiovascular health.
Living in the city often encourages people to walk more due to the proximity of amenities and the availability of public transportation. Walking is a form of exercise that can improve cardiovascular health, leading to a healthier lifestyle.
By choosing to live in the city and walking more, individuals can incorporate exercise into their daily routine, potentially leading to better overall health and well-being.