The question asks about the percentage of the Sun`s energy that actually reaches the surface of the Earth. The correct answer is option 2, which states that 51% of the Sun`s energy reaches the Earth`s surface.

Option 1 suggests that only 47% of the Sun`s energy reaches the Earth`s surface, while option 3 suggests that 67% does, and option 4 suggests that 77% reaches the surface.

It is important to note that the Sun`s energy radiates towards Earth in the form of solar radiation, which includes visible light, infrared radiation, and ultraviolet radiation. However, not all of this radiation reaches the Earth`s surface.

The Earth`s atmosphere plays a vital role in determining how much of the Sun`s energy reaches the surface. The atmosphere absorbs some of the solar radiation, and clouds and gases in the atmosphere scatter and reflect a portion of the radiation back into space. As a result, only a fraction of the Sun`s energy is able to reach the surface.

Based on scientific estimates, approximately 51% of the Sun`s energy actually reaches the Earth`s surface. This energy is essential for various processes on Earth, such as photosynthesis, weather patterns, and the distribution of heat across the planet.