Which of the following metals was first discovered by man?

Options

A. Bronze
B. Silver
C. Iron
D. Copper

Explanation

To answer the question, "Which of the following metals was first discovered by man?" we will analyze the options provided: bronze, silver, iron, and copper.

### Step-by-Step Solution:

1. **Identify the Metals**: The options given are:
- A) Bronze
- B) Silver
- C) Iron
- D) Copper

2. **Understanding the Metals**:
- **Bronze**: This is an alloy made primarily of copper and tin. Since it is a combination of metals, it cannot be the first metal discovered.
- **Silver**: This is a pure metal, but it was discovered later than copper.
- **Iron**: This metal was also discovered after copper. The use of iron became prominent during the Iron Age, which came after the Copper Age.
- **Copper**: This metal has a long history of use by humans, dating back over 10,000 years.

3. **Historical Context**:
- Copper was discovered around 10,000 years ago in northern Iraq. It is known to be the first metal that humans utilized for tools and ornaments.

4. **Conclusion**: Based on historical evidence, copper is recognized as the first metal discovered by humans.

The correct answer is **D) Copper**.