What is the simplest form of (4x3 + 6x – 7) + (3x3 – 5x2 – 5x + 9)?

A. 7x3 – 5x2 – x + 2
B. 7x3 – 5x2 + x + 2
C. 7x3 + x2 – 5x + 2
D. 7x6 – 4x2 + 2