The correct answer is b) A president addressing the nation. 
Oration is a formal speech given usually at an official occasion, such as a president giving a speech. Orations are usually given at funerals, weddings, formal ceremonies, such as graduation, in the court of law, at conferences, inaugurations, etc. 
 
        
             
        
        
        
The answer is:  "subject<span>–verb agreement".   
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Answer: A. The first section establishes pesticide toxicity; then, the second section analyzes problematic factors with its use.
Explanation:
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