The answer to your question has to be B
        
                    
             
        
        
        
Answer:
A - Compulsory education.
Explanation:
Compulsory education, as it's name suggests, refers to the requirement of all people to be educated by the government. Depending the country and type of society, what is perceived as education may change (could be homeschooling or registered schooling). It's a double movement for parents given that they are to see that their children receive instruction and the government has to provide the opportunities. 
 
        
             
        
        
        
 Oil and silk  because the Africans would make  dresses out of the silk
        
             
        
        
        
<span>These clues are called 'binaural' clues. 'Aural' refers to ears and the prefix 'bin' means that the clue requires both ears. These clues usually take two forms: interaural time difference, in which the difference in when the same sound is picked up by both ears is determined, and interaural level difference, in which the difference in loudness is determined.</span>