Answer:
While the main idea is usually in the first sentence, the next most common placement is in the last sentence of a paragraph. The author gives supporting information first and then makes the point in the last sentence. Here's a paragraph we can use as an example.
Explanation:
 
        
             
        
        
        
 C. where no considerable European settlement is possible
Though all the passage clearly expresses the author's idea to convey that British is superior to all countries, option C is the phrase that most clearly suggest that. 
By using the words "no (...) is possible", the author expresses that normally people considered impossible/unfeasible a big European settlement in their lands, but since they are the British Empire, they are superiors and therefore they are the ones who can make it possible.
 
        
                    
             
        
        
        
I think that the answer is D. Hope that helps. 
  
        
             
        
        
        
The simile “lay down / to sleep like a snow-covered road / winding through pines” refers to— death.  Author employs simile in order to compare his loneliness that was caused by death of his father to the loneliness that we can feel in cold winter walking down empty and deserted streets. In this way author <span> makes a description of his feelings more emphatic and appealing to a reader.</span>