Lucia finds that (3x²+3x+5) + (7x²-9x+8) = 10x²-12x+13. What error did Lucia make?
A) She found the difference instead of the sum.
B) She combined the terms 3x² and 7x² incorrectly.
C) She combined the terms 3x and - 9x incorrectly.
D) She did not combine all like terms.
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