Natural gas is considered a conventional resource.
Explanation:
- Conventional resources are those that have been traditionally used for energy generation and are well-established in industries worldwide.
- Natural gas (Option C) is a fossil fuel that has been extensively used for power generation, heating, and as a fuel for vehicles.
- In contrast, wind energy (Option A), solar energy (Option B), and tidal energy (Option D) are non-conventional or renewable resources because they are newer and more sustainable alternatives to fossil fuels.