The first and the third sentences contain parallel structures. Parallel structure, or parallelism, is the repetition of the same grammatical structure or form within a sentence, so it becomes more balanced, and, therefore, more readable and clear to understand.
In the first sentence, the parallel structure has been used in the comparison: "... would make war <em>rather than let</em> the nation survive and accept war<em> rather than let</em> it perish..." 
In the third sentence the same grammatical form has been used too: "<em>all dreaded it </em>(1) <em>all sought to</em> avert <em>it </em>(2)."
 
        
                    
             
        
        
        
Answer: it’s kinda obvious that it’s answer choice B. 
Explanation:
I did this test last week and got a 100%
I’ve also had practice questions extremely similar, so yeah it’s answer choice B.
 
        
                    
             
        
        
        
I'm not 100% sure but I believe the answer is B.