Metals can be extracted easily and economically from.

Options

A. mineral
B. metallic compound
C. ore
D. rock

Explanation

To answer the question "Metals can be extracted easily and economically from," we need to analyze the options provided: mineral, metallic compound, ore, and rock.

### Step-by-Step Solution:

1. **Understanding the Options**:
- **Mineral**: A naturally occurring substance from which a metal can be extracted. However, extracting metals from minerals can be expensive and not cost-effective.
- **Metallic Compound**: This refers to compounds that contain metals. Metals are not typically extracted directly from these compounds as they require more complex processes.
- **Ore**: This is a naturally occurring solid material from which a metal or valuable mineral can be extracted profitably. Ores are generally more economical and easier to process.
- **Rock**: This is a solid mass of minerals or mineral-like matter. Rocks may contain metals, but they are usually found in very low concentrations, making extraction impractical.

2. **Analyzing Ore**:
- Ores are specifically defined as materials that contain sufficient metal content to make extraction economically viable. For example, hematite (Fe2O3) is an iron ore from which iron can be extracted easily and economically.

3. **Conclusion**:
- Based on the analysis, the most suitable answer is **ore**. Ores provide a cost-effective and efficient means of extracting metals compared to minerals, metallic compounds, or rocks.

### Final Answer:
Metals can be extracted easily and economically from **ore**.

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