Find the difference:

Find the difference:
(25a³ + 14a² + 9a) – (-6a³ – 14a² + 8a)
A. 19a³ + a
B. 31a³ + 14a² + a
C. 19a³ + 17a
D. 31a³ + a
E. 31a³ + 28a² + a

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