Final answer:
The health risks in a developing country shift from traditional hazards such as malnutrition and poor sanitation to modern risks like high blood pressure and obesity as it becomes more developed.
Step-by-step explanation:
As countries transition from being poor and developing to more affluent and developed, the health risks associated with disease change significantly. In the initial stages of a developing country, the challenges primarily involve traditional hazards such as malnutrition and poor sanitation, which contribute to water-related diseases and a higher burden of illness and death. As development progresses, modern hazards start to become more prevalent.
With technological advancements and the availability of modern medicine, along with behavioral changes such as less physical activity and the consumption of fast food, the challenges shift towards metabolic syndrome which includes obesity, high blood pressure, and other noninfectious diseases like heart disease, diabetes, and cancer. This can be driven by sedentary lifestyles, unhealthy diets, and reliance on processed foods. Thus, the correct answer to the student's question is (d): the initial challenges are malnutrition and poor sanitation, which change to high blood pressure and obesity.