Exhaustible natural resources are:

Options

A. unlimited in quantity.
B. limited in quantity
C. not dependent on nature
D. not exhausted by human activities.

Explanation

### Step-by-Step Solution:

1. **Definition of Exhaustible Natural Resources**:
- Exhaustible natural resources are those resources that are available in limited quantities and can be depleted or exhausted through continuous use.

2. **Characteristics**:
- These resources are derived from nature and are sources of energy.
- They are finite, meaning there is a limit to how much is available.

3. **Examples**:
- Coal: It is an exhaustible resource because if we use it excessively, it will eventually run out. The formation of coal takes millions of years, making it non-renewable in a human timescale.
- Petroleum: Similar to coal, petroleum is also an exhaustible resource. Its availability is limited, and over-extraction can lead to depletion.

4. **Conclusion**:
- Therefore, exhaustible natural resources are those that can be depleted through human activity and are not replenished in a short time frame.