The correct answer is Clearing forest

An anti-forest measure is an action that harms or damages the natural forest ecosystem. Out of the options given, option C – Clearing forest, is an example of an anti-forest measure.

Forests are an essential part of our ecosystem, and they provide many benefits to the environment and human society. They help regulate the climate by absorbing carbon dioxide from the atmosphere, provide habitat for wildlife, and support biodiversity. Forests also provide many resources that are essential for human well-being, such as wood, medicines, and food.

Clearing forests involves cutting down trees and removing vegetation from an area of land. This process can lead to several negative impacts, including soil erosion, loss of biodiversity, and changes in the local climate. It can also have serious consequences for the communities that depend on the forest for their livelihoods.

On the other hand, afforestation, which is option A, is an example of a pro-forest measure. It involves planting trees in areas where forests have been cleared or where they have never existed before. Afforestation helps restore degraded land, sequesters carbon, and supports biodiversity.

Selective grazing, option B, is a process in which only some areas of a pasture are grazed by livestock, while other areas are left to recover. This practice can help prevent overgrazing and reduce the negative impacts on the natural ecosystem.

Selective felling, option D, is a process of cutting down only some trees in a forest, while leaving the others standing. This practice can help maintain the ecological balance of the forest, while still allowing for the harvesting of timber.

In conclusion, an anti-forest measure is an action that damages the natural forest ecosystem, and clearing forests is an example of such a measure. It is important to protect and conserve our forests, as they play a critical role in supporting life on earth.