Environmental problems cause health problems. Substantial changes in lifestyle can reduce environmental or health problems, but this idea appears almost impossible to adopt. With environmental problems, individual efforts can be perceived as having a negligible effect and therefore lead to inertia. With health, on the other hand, individual choices can make the difference between life and death, literally. And yet, barring a few, there seems to be the same collective lethargy towards making their choices. Which one of the following statements best implies the most rational assumption that can be made from the passage?

The passage highlights a "collective lethargy" towards making individual choices that could prevent both environmental and health problems, even when health choices can literally mean the difference between life and death.

Let's analyze each option:

A) We are likely to spend more money on cure than prevention. This is the most rational assumption. If there is a collective unwillingness to adopt preventive lifestyle changes (as stated in the passage), then problems will inevitably arise. When problems arise, people will seek solutions, which are typically "cures" for health issues and reactive measures for environmental problems. This implies that more resources (money) will be directed towards fixing problems after they occur, rather than preventing them. The passage describes a human tendency to avoid prevention, making the need for cure more likely and costly.

B) It is the job of the government to solve our environmental and public health problems. The passage focuses on individual efforts and choices, and the inertia towards them. While governments have a role, the passage does not imply that the responsibility solely lies with the government, nor is this the most rational assumption derived from the text's focus on individual behavior.

C) Health can be protected even if environmental problems go on unattended. The first sentence of the passage states, "Environmental problems cause health problems." This directly contradicts the idea that health can be protected if environmental problems are unattended.

D) Loss of traditional lifestyle and the influence of western values led to some unhealthy ways of living. The passage discusses "substantial changes in lifestyle" and "unhealthy ways of living" but does not attribute their cause to the "loss of traditional lifestyle" or "western values." This is an external explanation not supported or implied by the passage itself. The passage focuses on the reluctance to adopt healthy lifestyles, not the historical reasons for unhealthy ones.

Therefore, option A best implies the most rational assumption, as it logically follows from the observed human behavior of neglecting preventive measures described in the passage.