In which of the following uses of nitrogen, its characteristic property of inert nature is not exploited?

Options

A. It is used to preserve biological specimen.
B. It dilutes the activity of oxygen present in the atmosphere.
C. It is used to preserve food materials.
D. Nitrogen is used for the synthesis of ammonia.

Explanation

To determine in which of the following uses of nitrogen its characteristic property of inert nature is not exploited, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understanding Nitrogen's Inert Nature:**
- Nitrogen is known for its inertness, meaning it does not readily react with other substances. This property is often utilized in various applications to prevent unwanted reactions.

2. **Analyzing Each Option:**
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