Add or subtract as indicated.(-2r4 + 9r3 - 3r) - (8r4 - 9r3 + 6r2 - 2r)
A. 10r4 - 18r3 + 6r2 + r
B. -10r4 + 18r3 - 6r2 - r
C. 6r4 + 6r2 - r
D. -6r4 - 6r2 + r
Answer: B
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 