The correct answer is C) Wind energy.
Wind energy is a renewable energy source that holds great potential in coastal Karnataka. The state has a long coastline with a high average wind speed, making it ideal for wind power generation. In fact, Karnataka is one of the leading states in wind power generation in India.
Tidal energy is another renewable energy source that has potential in coastal Karnataka. However, tidal energy is more expensive to generate than wind energy, and there are fewer sites suitable for tidal power plants.
Solar energy is a renewable energy source that has potential in all parts of Karnataka, not just coastal areas. However, solar energy is not as well-suited to coastal areas as wind energy, because the sun’s rays are less intense at higher latitudes.
Hydropower is a renewable energy source that is not well-suited to coastal Karnataka. This is because the state does not have many rivers that are suitable for hydropower projects.
In conclusion, the renewable energy source that holds great potential in coastal Karnataka is wind energy.