What is a reason that people are living longer today than in the past?

Vaccines, antibiotics, and improved medical care have played a crucial role in increasing life expectancy in modern society. The development and widespread use of vaccines have significantly reduced the incidence of infectious diseases that once claimed many lives, particularly among children. Antibiotics have transformed the treatment of bacterial infections, making it possible to effectively manage conditions that would have been fatal in the past. Additionally, advancements in medical care, including more effective surgeries, improved healthcare infrastructure, and better access to healthcare services, contribute to the prevention, early detection, and treatment of various health issues. Collectively, these factors have led to a substantial decrease in mortality rates and have contributed to longer life spans.

While advancements in technology, increased physical activity, and better dietary habits can positively impact individual health and well-being, they are not the primary reasons for the dramatic increase in life expectancy seen in recent decades. Vaccines, antibiotics, and improvements in medical care have had a direct and significant effect on public health outcomes, thus making option B the most fitting choice in the context of this question.