Explanation:

- The sentence discusses the role of fertilizers and insecticides in agriculture, focusing on a term that describes the result of using these innovations.

- Option 1: Cargo refers to transported goods, not directly relatable to what is produced or increased in agricultural context.

- Option 2: Goods are items produced for sale, but it doesn't specifically capture the idea of agricultural growth or volume.

- Option 3: Output refers to the total amount produced, making it directly appropriate for discussing increased agricultural production.

- Option 4: Product can mean a specific item, which doesn't convey the overall increase in quantity.

Option 3: Output is the most suitable choice as it clearly relates to an increase in production.