This is punctuated correctly. 
"Marshmallows are my favorite snack" is a complete sentence unto itself.
The comma instead of a period shows that the sentence spoken is part of the whole sentence, which includes the speaker (she) and a word to describe how the speaker said it (explained). 
        
             
        
        
        
Answer:
ballet
Russian
tambourine
Explanation:
Trepak is a subdivision of classical dance from Tchaikovsky's "The Nutcracker" and its origin takes sources from classical Russian and Ukranian folk dances. Trepak is on of the most popular dances from the Tchaikovsky's piece, and its cheerful and powerful rhythm requires enormous strength and resistance from dancers.
 
        
             
        
        
        
Afterward is the correct answer
        
                    
             
        
        
        
The answer is  the first one/