Read the passage and choose the best answer

We have cut down so many trees that there are now vast areas of waste land all over the world. As a result, farmers in parts of Africa can’t grow enough to eat. In certain countries in Asia there is too little rice. Moreover, we do not take enough care of the countryside. Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many for them to survive. However, it isn’t simply enough to talk about the problem. We must act now before it is too late to do anything about it. Join us now to save the earth. This is too important to ignore.

Since so many trees are cut down, __________.

• A. 
  there is too little rice in Asia
• B. 
  tigers are rare
• C. 
  there are vast parts of wasteland
• D. 
  wild animals are quickly disappearing