The following words should be capitalized: B) A, D) Sound, and C) Thunder.
When it comes to the names of novels an such, all words (except for prepositions and linking verbs) should be capitalized. For example - The Lord of the Rings, A Sound of Thunder, etc.
        
             
        
        
        
Explanation:
B I think I'm not exactly sure sorry if its wrong 
 
        
             
        
        
        
All of the following are symbols in the play except:
<h3>What is a Symbol?</h3>
A symbol is an object that represents something else. Jim is a character in the story, "The Glass Menagerie." 
However, the other things mentioned which include the unicorn, dance hall, and the alley were all symbolic. The unicorn symbolized loneliness.
Learn more about symbolism here:
brainly.com/question/15816956
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