Choose one of the factors that threatens biodiversity and suggest one way in which biodiversity can be preserved in a real-live scenario

One of the factors that threatens biodiversity is deforestation. Deforestation threatens biodiversity because it is destroying the habitats of many animals and without their habitats, the animals die. One way biodiversity can be preserved is to limit deforestation. On a small scale, an individual can help to do this by reusing their paper bags so that is a less demand for paper and as a result, trees to be cut down.

Its either a) or b),wind and water erosion gradually widen the canyon

Ther are many reasons.. is it a multiple choice?