Option 1: The first option states that the approximate percentage of carbon in the Earth`s crust is 0.045%. This means that for every 100 parts of the Earth`s crust, 0.045 parts are carbon.

Option 2: The correct answer is option 2, which states that the approximate percentage of carbon in the Earth`s crust is 0.025%. This means that for every 100 parts of the Earth`s crust, 0.025 parts are carbon.

Option 3: The third option suggests that the approximate percentage of carbon in the Earth`s crust is 0.015%. This means that for every 100 parts of the Earth`s crust, 0.015 parts are carbon.

Option 4: The fourth option proposes that the approximate percentage of carbon in the Earth`s crust is 0.005%. This means that for every 100 parts of the Earth`s crust, 0.005 parts are carbon.

Based on the correct answer provided, we can conclude that the approximate percentage of carbon in the Earth`s crust is 0.025% or 25 parts per million (ppm). It is important to note that while carbon is a relatively small component of the Earth`s crust, it plays a crucial role in