Which gear is appropriate to start driving a passenger car on a dry surface?

You start driving a passenger car on a dry surface in first gear - answer B. Second gear (A) is sometimes used only on a very slippery surface, to limit the torque at the wheels and avoid a skid when moving off, and the gear in which you finished driving (C) does not matter at all for moving off the next time.

First gear has the highest gear ratio, so the engine transfers the greatest force to the wheels at low speed, and the car moves off smoothly, without jerking and without stalling. Moving off in second gear on a dry road requires the clutch to slip for longer, which makes it wear faster, and with a heavier load, for example uphill or with passengers, it ends with the engine stalling. The order is always the same: you press the clutch, select first gear, release the handbrake, slowly let the clutch up to the biting point and add a little accelerator; you engage second gear after reaching about 15-20 km/h. In a car with an automatic gearbox, position D is enough - the gearbox will choose first gear itself.