A.I. Explanation:

Option 1: "Increasing furniture life"

Explanation: This option is incorrect because the text does not mention anything about furniture or its longevity. The focus of the text is on the benefits of indoor plants, specifically their impact on air quality and health.

Option 2: "Enhancing home security"

Explanation: This option is incorrect as the text does not discuss home security at all. The primary focus is on the aesthetic and health benefits of indoor plants, not on security aspects.

Option 3: "Reducing noise pollution"

Explanation: This option is incorrect because the text does not address noise pollution. It emphasizes the improvement of air quality and health benefits associated with indoor plants, which does not include noise reduction.

Option 4: "Improving air quality and health"

Explanation: This option is correct as the text explicitly states that indoor plants improve air quality by absorbing toxins and producing oxygen. Additionally, it highlights health benefits such as boosting mood, reducing stress, and enhancing concentration, making this option the most relevant to the main idea presented in the text.