**Explanation:**

The correct answer is option B) Afforestation.

**Definition:**
Afforestation is the process of establishing a forest, or stand of trees, in an area where there was no forest. It involves the planting of trees in an area where there were no trees before, or where the tree cover has been significantly reduced.

**Explanation in detail:**

1. **Deforestation:**
Deforestation is the opposite of afforestation. It refers to the clearing, removal, or destruction of forests or stands of trees, often resulting in the conversion of forested areas to non-forested land for various purposes such as agriculture, urbanization, or industrialization. Deforestation leads to the loss of biodiversity, habitat destruction, soil erosion, and climate change.

2. **Afforestation:**
Afforestation, on the other hand, is the process of establishing a forest in an area where there was no forest. It involves the deliberate planting of trees on land that was previously devoid of trees, or where the tree cover has been significantly reduced. Afforestation is an important strategy for mitigating the effects of deforestation and combating climate change.

3. **Reforestation:**
Reforestation is the process of replanting trees in an area where a forest has been harvested or destroyed. It involves the restoration of a forest that has been depleted or damaged. Reforestation aims to restore the ecological functions and services of a forest ecosystem, such as carbon sequestration, watershed protection, and habitat provision.

4. **Difference between afforestation and reforestation:**
While both afforestation and reforestation involve the planting of trees, the main difference lies in the starting point. Afforestation starts with an area that was previously devoid of trees, while reforestation starts with an area where a forest existed before but was depleted or destroyed.

5. **Conclusion:**
Therefore, the correct answer to the question "The growing more and more of plants is called" is option B) Afforestation. Afforestation refers to the process of establishing a forest in an area where there was no forest, by planting trees.

Afforestation is the establishment of a forest or stand of trees (forestation) in an area where there was no previous tree cover.
Many government and non-governmental organizations directly engage in programs of afforestation to create forests, increasecarbon capture and carbon sequestration, and help to anthropogenically improvebiodiversity. In the UK, afforestation may mean converting the legal status of some land to royal forest.