What is the sum? (g2 – 4g4 + 5g + 9) + (–3g3 + 3g2 – 6)
A. –7g4 + 4g3 – 3g2 + 5g – 3
B. –4g4 – 3g3 + 4g2 + 5g + 3
C. –4g4 + 4g2 + 14g – 6
D. –3g4 + 14g – 6