Option 1: Helium-I: Helium-I is a term used to describe normal helium, which is a readily available element on Earth. However, it is not abundant on the lunar surface and does not hold the potential to solve the energy crisis on Earth.

Option 2: Helium-II: Helium-II is a form of helium that exhibits superfluidity at extremely low temperatures. It is not abundant on the lunar surface and does not hold the potential to solve the energy crisis on Earth.

Option 3: Helium-III: Helium-III is a very rare isotope of helium that has potential as a future energy source. It is abundant on the lunar surface and has unique properties that could be harnessed to address the energy crisis on Earth. It has the ability to be converted into helium-4, releasing large amounts of energy in the process.

Option 4: Helium-IV: There is no known helium-IV isotope. Therefore, this option is incorrect.

The correct answer is option 3, Helium-III, because it is abundant on the lunar surface and holds the potential to address the energy crisis on Earth.