Ralph and Piggy go to the pig roast because they didn't want Jack and his tribe to do anything bad. It's prophetic because it foreshadows that something bad is going to happen.
        
             
        
        
        
B. B. The children I believe it’s ‘B. the children’
        
                    
             
        
        
        
Hello. You did not enter the text to which the question refers, which makes it difficult to accurately compose an answer. However, I will try to help you in the best possible way.
A context clue occurs when you don't know a word, or one of its meanings, but the entire text, or another word in the same sentence, presents you with a context that allows you to understand what the unknown word represents.
In the case of your question, you should look for a word in the sentence that is related to the word "mission" and that is contextualizing it. Esssa is the context clue.