Explanation:

- A sweet shop purchases sugar as an intermediate good because it uses sugar to produce other products such as sweets and desserts. This is not the end of the production process.

- When a consumer buys sugar, it is a final good because it is used for personal consumption without further transformation into another product.

- Option 1: Capital, final - Incorrect, as sugar is not a capital good for a sweet shop.

- Option 2: Final, intermediate - Incorrect, reverses meanings.

- Option 3: Intermediate, final - Correct!

- Option 4: Final, producer - Incorrect, these terms don't accurately categorize sugar.