Simplify the following expression.
3x4 + 2x3 - 5x2 + 4x2 +6x-2x - 3x4 + 7x3 - 3x3
A. 7x5 + 6x4 – x3 – x2
+4x
B. 7x5 - 6x4 + 5x? - x2 + 4x
C. 7x5 - x - x2 + 4x
D. 10x4 + x2 + x2 + 4x

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