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Combine like terms to simplify the expression:     
7x + 3y – 2 + 6x – 1 – y2
  

A.
–2y3 + 13x – 3
  
B.
–y2 + 3y + 13x – 3
  
C.
–y2 + 3y + 42x2 –3
 
 D.
–3y3 + 13x2 – 3