Final answer:
In the 1900s,the leading causes of death were b) Infectious diseases, tuberculosis, and pneumonia or influenza
Step-by-step explanation:
In the 1900s, the leading causes of death were primarily infectious diseases, tuberculosis, and pneumonia or influenza. During this period, advancements in healthcare, sanitation, and the development of vaccines were still in their early stages. As a result, infectious diseases, particularly respiratory infections like tuberculosis and pneumonia or influenza, were major contributors to mortality.
In the 1900s, before the significant progress made in understanding and managing chronic conditions, infectious diseases were responsible for a large portion of deaths.
Improved public health measures, vaccination programs, and the discovery of antibiotics played crucial roles in reducing the impact of infectious diseases over the course of the century. The shift from infectious diseases to non-communicable diseases as leading causes of death reflects the advancements in medicine and public health strategies achieved over the years.
In summary, during the 1900s, infectious diseases, tuberculosis, and pneumonia or influenza were the leading causes of death. The understanding of disease patterns and the subsequent development of effective interventions have significantly influenced the evolution of public health and healthcare practices throughout the 20th century.