The one ingredient that helps, but is not necessary to an effective speech delivery, is that it is the result of the speaker's natural talent and gift.
With proper preparation and a healthy dose of courage, anyone can be an effective public speaker. The important elements are that message delivery is impactful, the speech is influential towards the audience, and that audience expectations are met or exceeded. Natural talent helps, but thorough preparation and careful speech planning go much farther towards an effective speech. 
        
             
        
        
        
C - the Sheriff did not understand the true meaning of what Mrs. Hale
said. There were multiple ways to make what she was making and the men
walking in did not know the intricacies of the process and assumed it
was just what the word phonetically sounded like.
        
             
        
        
        
I believe that the best answer among the choices provided by the question is <span>D) The Greenberg article shares research about Marshall, while the informational text is based on an interview.</span>
Hope my answer would be a great help for you.    If you have more questions feel free to ask here at Brainly.
        
                    
             
        
        
        
Answer: He begin to think of ways to improve the lives in his community
Explanation 
The answer is "He begin to think of ways to improve the live sin is community because in the text most the the passage identifies the problem, then he thinks about building a generator and the bigger battery.
Why the other answers are wrong 
A is wrong because it tells us the solution not the central idea. 
C identifies the problem, not the Central idea of the text.
D is wrong because it tells us his decision, it is better than the other answers but not the best.