A car with mass $m$ moves uphill at steady speed on a slope inclined at an angle $\theta$ to the horizontal, as shown in the diagram. Air resistance and friction create a resistive force $F$. What force is required to drive the car at this steady speed?
- A$mg\cos\theta$
- B$mg\sin\theta$
- C$mg\cos\theta + F$
- D$mg\sin\theta + F$