Extensive plantation offers to increase forest cover is
Afforestation
The correct option is B.
Explanation of correct option:
Explanation of incorrect options:
Option A:
Deforestation refers to a large number of cutting of trees from the forest.
Option C:
Agroforestry refers to a land-use system that integrates trees and shrubs on rural lands to enhance productivity and ecosystem sustainability.
Option D:
Social forestry refers to the management and protection of forests, and afforestation of barren and deforested lands with the purpose of helping in the environmental, social, and rural development.
Final answer: Extensive plantation offers to increase forest cover is afforestation.