A.I. Explanation:

Option 1: "To increase the use of chemical fertilisers in farming"

Explanation: This option contradicts the main idea of sustainable agriculture, which emphasizes reducing environmental impact. The text advocates for practices like organic farming and natural pest controls, which typically involve less reliance on chemical fertilizers.

Option 2: "To reduce the efficiency of food production"

Explanation: This option is incorrect because the text states that sustainable agriculture aims to produce food more efficiently. Therefore, the goal is not to reduce efficiency but to enhance it while being environmentally conscious.

Option 3: "To promote the import of food products"

Explanation: This option does not align with the text's focus on local economies and sustainable practices. The article emphasizes local production and fair wages for farmers, which contradicts the idea of promoting imports.

Option 4: "To address food security, environmental health, and economic viability"

Explanation: This option accurately reflects the main goal of sustainable agriculture as stated in the text. The article highlights that sustainable practices aim to tackle food security, enhance environmental health, and ensure economic viability, making this the correct answer.