Deforestation has immediate consequences for the local population in terms of increased fuel scarcity, reduced supply of fodder, and leaf-litter manure. The unpredicted erosion, landslide, and lowland flooding, due to deforestation, are also major concerns in Nepal as well as in downstream countries...!
The best option seems to be the second one, letter B) This concept is mentioned throughout the book.
The book The Call of the Wild, by Jack London, has as its theme the concept of "survival of the fittest". Survival of the fittest is an expression connected to Charles Darwin's theory of evolution. Organisms which are able to adapt to the environment survive. Those which are not end up extinct.
That is precisely what happens in the story by London. The main character is a dog, Buck. Buck is stolen from a family with whom he lived a comfortable life. He has to adapt to a whole new environment and conditions as a sled-dog. He turns out to be so adaptable that he becomes the leader of a pack of wolves by the end of the story.
