Simplify.
p2(6p2 - 9pq + 3q2) - q2(4q2 - 7pq + p2)
A. 2p2 - 3p2q + 7pq2 - 4q2
B. 2p4 + 4p3q - 4q4
C. 2p4 - 3p3q + 2p2q2 - 7pq3 - 4q4
D. 2p4 - 3p3q + 7pq3 - 4q4
Answer: D
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