A.I. Explanation:

Option 1: "Civilisation must suffer the consequences of self-control and self-denial."

Explanation: This option misinterprets the author's view. The text does not suggest that civilisation suffers from self-control and self-denial; rather, it indicates that moderation is essential for health and longevity. The phrase 'self-control and self-denial' implies a negative consequence, which contradicts the author's argument that moderation leads to better lives.

Option 2: "Unnecessary waste of life is the natural consequence of civilisation."

Explanation: This option inaccurately reflects the author's opinion. The text does not claim that civilisation leads to a waste of life; instead, it argues that civilisation can promote health if people live moderately. The term 'unnecessary waste of life' suggests a fatalistic view that is not supported by the text.

Option 3: "People should live in comfort and health beyond what is now considered old age."

Explanation: This option misrepresents the author's stance. The text emphasizes moderation and simplicity rather than advocating for excessive comfort or health beyond current standards. The phrase 'beyond what is now considered old age' implies an unrealistic expectation that contradicts the author's warning against immoderation.

Option 4: "Life of immoderation is neither natural nor desirable."

Explanation: This option accurately captures the author's opinion. The text argues that while civilisation can promote health, it becomes detrimental when it leads to immoderation and luxury. The phrase 'neither natural nor desirable' aligns with the author's warning about the dangers of excessive comfort and the decay of moral and physical fiber, supporting the main idea that moderation is key to a healthy life.