What is used as a sowing agent in the preparation of soft drinks ?

Options

A. Phosphorus acid
B. Boric acid
C. Benzoic acid
D. Phosphoric acid

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the substance used as a "sowing agent" in the preparation of soft drinks. It seems there might be a typo in the term "sowing agent," which should likely refer to "souring agent" or "soda agent."

2. **Identifying the Role of the Agent**: In soft drinks, the agent in question is responsible for providing acidity and flavor, as well as preserving the drink by inhibiting the growth of bacteria and molds.

3. **Identifying the Specific Agent**: The primary agent used in soft drinks for these purposes is phosphoric acid.

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