The correct answer is the 3rd one. 
Many people felt the sound didn't come out loud enough, so other inventors figured out ways to use electricity to make the sound louder.
        
                    
             
        
        
        
Answer:
B. cognitive therapy
Explanation:
Cognitive therapy: In psychology, the term cognitive therapy refers to the process of focusing on the present or ongoing behavior, communication, and thinking instead of focusing on the past experiences in an individual's life and considered to be oriented towards problem-solving.
The therapy is useful in treating various problems, for example, fears, depression, eating disorders, anxiety, substance abuse, panic attacks, and personality problems.
Cognitive therapy aims at changing or altering the self-defeating behaviors and cognitive distortions in an individual's life.
 
        
             
        
        
        
Answer:
Primary source is more reliable, but writers tend to use both primary and secondary source.
 
        
             
        
        
        
Answer:
C
Explanation:
Promoting welfare of citizens and securing the blessings of liberty are a right to the people. 
 
        
             
        
        
        
During a war, some governments change their economic system from a market economy to a command economy. This is done out of necessity as resources may become scarce.