List the like terms of the expression.-13xy + 5xy2 - 9x2y - 4xy2 + xy
A. 5xy2 and - 4xy2 are like terms
B. -13xy and xy are like terms
5xy2, - 9x2y, and - 4xy2 are like terms
C. -13xy and xy are like terms
5xy2 and - 4xy2 are like terms
D. -13xy and xy are like terms
Answer: C
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A. 
B. 
C. 
D. 
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