Integrate x² + x + x⁻³ with respect to x:
a) {x³}/{3} + {x²}/{2} - {1}/{2x²} + C
b) {x³}/{3} + {x²}/{2} - {1}/{x⁴} + C
c) {x³}/{3} + {x²}/{2} - {1}/{x²} + C
d) {x³}/{3} + {x²}/{2} - {1}/{3x³} + C