I'd say b, but I feel this could be somewhat open to interpretation.
        
                    
             
        
        
        
B is the only sarcastic option, and is therefore the best answer.
        
                    
             
        
        
        
Answer:
Bird-watchers should note if they see birds doing anything strange, “since erratic behavior can signal a stressed or unhealthy bird” (“What Is That Bird?”).
Explanation:
since erratic behavior can signal a stressed or unhealthy bird
Is a direct quote from the source and should be in " " 
 
        
             
        
        
        
Answer:
Quotation 1 contains a capitalization error.
Quotation 2 wrongly uses 'ellipses.'
Quotation 3 makes incorrect use of a comma.
Explanation:
The first quotation communicates a complete sentence and therefore, the first letter must be capitalized('The brave men') to make it grammatically correct. 
In the second quotation, ellipses have been used incorrectly. It is a punctuation mark consisting of three periods('...') to indicate the omission of a word or phrase that can be inferred from the text. It communicates a complete idea but in this quotation, the idea is not completed after 'nation...' and therefore, the readers are not able to understand it. 
The last quotation employs comma inappropriately succeeding the word 'finally' as the sentence is quite short and the use of comma unnecessarily breaks its meaning. There is no need for a comma here as the meaning is more clear and precise without using it.
 
        
                    
             
        
        
        
Answer:
C. It is difficult to seek treatment for depression, as it is viewed as a glorified form  of sadness rather than a serious mental illness.
Explanation:
In his speech, Andrew Solomon narrated his ordeal with depression. This disease is one suffered by many who do not really recognize its difference with sadness. They see depression as a mood which is normal for all humans, and so they do not believe that it requires treatments. They believe that it is something that can be adapted to. 
Andrew Solomon sees it differently. He compared sadness to an iron with little rust which can be overcome by just painting and polishing while he compared depression to an iron which has rusted by over a hundred years and has turned to "a pile of orange dust". So, depression is a serious medical condition that needs urgent attention.