Simplify the given expression. Write the answer with variables in alphabetical order and any constant term last.
y2z + 3xy2 - 15y2z + 9
A. 3xy2 - 24y2z + 9
B. 
xy2 + 24y2z + 9
C. 3xy2 + 24y2z + 9
D. 
xy2 - 24y2z + 9
Answer: A
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3 = 
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