I would say two: death is stronger than the earth and sea
        
                    
             
        
        
        
1. Two limitations are a lack of protection for whistleblowers, barriers to information access and constraints caused by public and government hostility to journalists.
 
        
                    
             
        
        
        
Answer:
The Alaskan hunters who discovered Chris body believed he had little knowledge about animals. 
Explanation:
Christopher McCandless lived into the wild by killing small animals like small birds, squirrels, porcupines, and one moose. He gathering mushrooms, roots, and berries. 
The moose identified as a caribou, but it was a moose. It showed that Chris was not as unprepared and stupid as everyone thought. 
Before he decided to go to Alaska,  he took a rifle, a bag of rice and some necessary tools and utensils with him. 
His dead body discovered by moose hunters just outside the northern boundary of Denali National Park. The cause of death officially reported as starvation.
 
        
             
        
        
        
The answer is (C), becuse the reader does not now was is threatening the characters lives. In the other answers it told "it" was thereatening their lifes. This is why (c) has the sentence fragment.
        
             
        
        
        
Is this a riddle, if so, my answer is Racecar.