## **Core Concept**
Food preservatives are substances added to foods to prevent spoilage and extend shelf life. They work by inhibiting the growth of microorganisms such as bacteria, yeast, and mold, or by preventing chemical changes that affect the quality of the food.

## **Why the Correct Answer is Right**
All three options listed - Lactic Acid, Sorbic Acid, and Sulphurous acid - are indeed used as food preservatives.
- **Lactic Acid** is a naturally occurring compound that acts as a preservative by creating an acidic environment, which inhibits the growth of many types of bacteria and mold.
- **Sorbic Acid** and its salts are widely used as food preservatives to prevent the growth of yeast and mold in foods such as cheese, wine, baked goods, and salad dressings.
- **Sulphurous acid** (or more accurately, its salts like sodium sulfite) is used as a preservative to prevent browning and spoilage in foods like dried fruits, wine, and to preserve the color and texture of foods.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not include all the correct preservatives listed.
- **Option B:** This option is incorrect because, similar to option A, it does not accurately represent the correct combination of preservatives.
- **Option C:** This option is incorrect for the same reason; it inaccurately represents the preservatives.

## **Clinical Pearl / High-Yield Fact**
It's crucial to note that while these substances are effective as preservatives, they can also have implications for human health, especially for individuals with certain sensitivities or conditions. For example, sulphites can trigger asthma attacks in sensitive individuals.

## **Correct Answer:** D. 1,2,3.