The correct option is C Assertion is true but reason is false
The best solution to deforestation (clearing or thinning of forests by humans) is reforestation.
Reforestation is the process of restoring a forest that once existed but was removed at some point due to various reasons such as forest fires, agricultural needs, logging, and mining.
Reforestation may occur naturally in a deforested area but it takes time. However, planting trees can convert the deforested area into a forest very soon. But planting trees should be done by considering the native flora of the area.
Hence the assertion is true but the reason is false.